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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3db5120ecf1d97a3a6436c8018120d4da8ffa1ed155b53c5ef7f375250bfb918. 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/7d7a236e-32e4-428c-9bed-84033ccf8629.json and https://artists.proofprofile.net/proofs/artist/7d7a236e-32e4-428c-9bed-84033ccf8629.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d5d60de593a781834251bc961afed870d5560f0c4c74426077cfab96f4f52f6. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLEE40802654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d5759b060f4340b841f3ec38371354bad23f5afd96650d67f474d3dc2937829. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBKQU2448624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30396adb668afb861c9a59f9349b529e5137a293a9e11255aeef4b50fc9029d8. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/DEA312400441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d1f476fee12e10d0c45c4689af7e185a50870c6e1d62ba9a507719442ee6e75. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEA312400442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8033f569823f43bc9d2e1a671957a7293e8caa0f4197c90cbe6f9483dde37bc. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEA312400252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf0eeb048d130005840c4294fb6ff10c58716914ccbeee9b39331eddaf113189. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/DEA312400253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46f8f6d20a5bfe33b67382d2c33851a01b6b206e817420525545d086f8de7fa1. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DK4YA2400095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfe372ae341fe5949adfda43400845c1955da83f5945573ce87654c42e94261c. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DEA312301067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73c8303e4b839b75d06228d8f764bf8c8e6f2e61ccf8a2dbc24f5524a98a1f96. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NL2QC2101222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3125b7d3012c3913dd3a6203af8d10275023a35ac8eed63500c8cf49ac8e5241. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/NL2QC2101223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x894cd30d83d188bc7cfe7f7e91e6ab065e54791aa3618ab595d7581ac18a8a1d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DK4YA2325001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf17e6b4e582e4703efcc9b4093a49940cba3322875dac4d94009c1ce41340632. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DK4YA2281801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7da0ec3a56a6e9dce49339399fd6f6299c32388cef4b8b98c85b30cd3a77892d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NL2QC2100232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab8e88b7a209859fda9a2b674d43e9087d3887a6a2759a91034865c039c705b4. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NL2QC2100189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd28d4fa5985a2ecf472b83aa2f34db9721507a1027d233cd36ac40752e50e122. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NL2QC2100154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x434f8199f24615f43013895bfa57e18fdaf926ed5fc3612130c8d32685c68caf. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/NLEE40800619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ada5043b5773d332ef52d9992e410cedf501d5f17e10b5f06f58335e47d0530. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NL2QC2000128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54aecb01c47894344e2f337544a54b54cd84b20c1ab55bd703cdf4fc6b7e70cf. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/NLC281110450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff53c2d3591783886448e21ed1f14a6a0b3f83249827fc8cfda9bf43b9e1bf1e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/US38Y2415890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd68c6b36bb2767644020d03558882eec865b4e9cbb51731bb22253265921041. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NL2QC2101479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7765054e81ed50f67625bd06649b2b7cfdcbf78b8f1552cbf296a5626ec150eb. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/NL2QC2101480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd608e987fde47bb9a70a217f9e88d1693b331e3155002bc6cc02fda35a2a5a5f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLEE40802662.