Sitti Katrina Baiddin Navarro-Ramirez (born November 29, 1984), known mononymously as Sitti, is a Filipino bossa nova singer. After releasing her first album, Café Bossa, in 2006, other bossa nova act
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bcf0931c4bb1bcf486074ff14da75b595d6be7f080f15f19c2080c7e5cb84bc. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d0ab1bbd-7482-47c5-9e41-f7c6317208e9.json and https://artists.proofprofile.net/proofs/artist/d0ab1bbd-7482-47c5-9e41-f7c6317208e9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
One Note Samba (feat. Jerome Rico on Guitar) - Live
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90fbbab328ab21c6e7c3f215944f1fbfac65f4680b0dc1112ebd9012c06bb91d. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T15:56:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010601005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5398396dc580c6651ab45419a4006ff02804aa270f54442fb3cb668381ae67eb. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010601006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10200142f893141922459dfaef1e549bc7b2016db9465760d83e1d428bc57d5a. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010601009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70277c25e51d331647d0e1bdf4fd1e743225309240640accb4a7189fcb153557. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010601010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x131651d29a225b72aa1836472b75f2206c95f9560d2bf81e162f705c2c4441c6. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010601011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ae1f89584029d0872d37f2933d42cd4f0aa803a931e09c8bfbf6c9574485cc8. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010601012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5707682a52c21ac105a5bb449a2fe2099715e023a401d1eb997818bbc937848. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010601013.
I Didn't Know I Was Looking for Love - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49a4b42bfe3ee15ff8cecc6d2039bd2c85d9fcbb4e7b6056819d4e6908fa9663. Chain 2 (Bitcoin): anchored in block 958325 (2026-07-17T00:13:14Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010601014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8de8a7fc67c12b8689f75fed001807e964afe86d7e40724c61869fe550269852. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010601015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66f7a63809d3e553fb64f3a08e55811e254bdc83dfa2ad17cdefa689b39b8c33. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010601018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb8ae4ff3d9f35923b5c2b1e056da7eed8684a5fa45de492859822b464f1488c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010601020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6ff4224dcc8a4063d007c9b4ee2b958e46135c7094a4cd25e70651b7e5d915a. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010601021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e3fcebae296b7f43a4027974a0c5f1afb93e82ee42a345ed13f89b01b340ea0. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010700361.
I Didn't Know I Was Looking for Love - Morning After Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3737d8b729fa94685e98da25e9ebd833d615535dcd4db874a3df5ef1680cc390. Chain 2 (Bitcoin): anchored in block 958325 (2026-07-16T23:54:44Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010700355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d97e9a67be835fbabe8055c9693b566101fa2a5d43fa11835dd8683624784d5. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010700362.
Tattooed on My Mind - Beach Avenue Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86fc2afb5bbaa837b8abe3dcab0f14610559b22d4e34762a330a1d71576c1312. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010700363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf73ed0b5e33f149077af0673153fdcc5af40a8e70953df4d4aa61400df7f7e9c. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010700364.
Interlude: Girl from Ipanema - Fastrack 2030 Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa052b4064f1dd5227171e8566bae6f98c243f1a7ece7a40b8e19e78e19d60136. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010700365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb02161ca21aa13143a1551ff87160f4e81c555d9ab95d6ceff208f08e379cb90. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010700366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeb5a5e1576361c423580fbff57aed57d5f661fcba32d37a07e9edfb707ba828. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010700367.
Interlude: One Note Samba - Out Take Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa01b28719399bd70d1a2ea93fff3d9045b63bec68dbe02367ee5cedb0c1a10b5. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010700368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc34ab990a081dcce8f40031f3f6962343e70e5187935ec657122b03835293dee. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010700369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4378c92008e982639923650a7ddc814353c6882d45aceb3a13e8a00f7e9c018. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010700371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa5916ea3ebfeab26d2fa3f94304164c625bb7b9307ad8eaac5cfa1d320599c0. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T18:23:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010700372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17f9de3a4f40dfd2e1d50129dc45538947afa0fff40422d7c31e7d095a677a80. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010700373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5165c76bcdc68f28b0d5a4eb3fc51c87f161a19f2489c5f097abfcb172365c4a. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010700514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ad9030962527a84a58d71ee9eafd07b946f3db403d9d46aa091462d5b977f2d. Chain 2 (Bitcoin): anchored in block 958303 (2026-07-16T16:39:24Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010700520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98773c57b372695f422bfb4cb8e29175dae057e0b4b040fd6d185a6e11902683. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010700522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x643961e0563cd66b149aed6c2b8ae34e27d822af202c5c87f3ddd96d797114ba. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010700527.
I Didn't Know I Was Looking For Love [Live]
Tattooed On My Mind [Beach Avenue Remix]
I Didn't Know I Was Looking For Love [Morning After Remix]
One Note Samba (feat. Jerome Rico on Guitar) [Live]
Interlude: One Note Samba [Out Take Remix]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02bac0f05009d89e3cb19d3bec105f919ba00b0bec7ea6d7cc55f56950f96b13. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010601007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd623ac11ddc85ce53dfaa139ecc8f4dfc84a004ccb3d27b3f82fce7d43d79a9d. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010900060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x772f23c1f0a2edcf8830615d7b9f9c053de23517d3564b1bdce4a50055d6f14d. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW010900062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22b9a33d7892d8f5ad9d24188d212d82cbdb8dcfa765a4ac247f955a0634c3de. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW011100017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb395bacd04cacec93f6cce1cc1f99307923ecd30ccf2492c61e64e700532ebab. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW011100035.
Wag Mo Na Munang Sabihin feat. Ebe Dancel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34ce01d2de38eaf214e6e5f802b2bce5992e6b2890dd64654a9e6bdd123e2c37. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHW011100061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87c9bb638ce73624a839e5247099fa382cc404877d7be0afca21d6c71bce2156. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHUM71800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47d2ff31e3d572e5ccff802584b093faa454138be2647740b405469b7903dbcf. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHUM71600323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ca09439b637a062f1fe4e32eb430be93740f98a1f896bdc4ee601da058a9557. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHUM71800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3886c75ce1cc9ffd6ced4ba11ec38cf819024a091e049fcb6d1cf2134d76aa04. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHUM71800005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72a94c8800f0eeb1965dd5ff7dedc1025fa3bad3517bb2f9c9fffcf673bff53d. Chain 2 (Bitcoin): anchored in block 957056 (2026-07-21T23:39:00Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHUM71300209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf72660dc7939aebbd50e7a91be30f7f9792b4efdc7d149618c283d7fd4d48563. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PHUM71300208.
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch