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 0x66a0d6176e6b761cc479dd96d96664f6e576eb8f3525b62547e17658b73fea11. 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/f1aff4ba-eb85-49a9-b529-2fc31f948c4c.json and https://artists.proofprofile.net/proofs/artist/f1aff4ba-eb85-49a9-b529-2fc31f948c4c.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 0x3c82cd8a71a700038a80f5bf053d46f7938043fe6cd98fed1911c78787befd3b. 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/SE4U92101002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedabb26e1c3dabfdb21fb0c55d85c21c35eb554b78571287e296342a91182eb2. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/SE4U92101003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad5afffeaecd4f54307a55cd5bbbf04ed18d5cb55bc748ee42cb1c20f3a3521d. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/SE4U92101007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd62e56396ef24c5df83f56b94e603aa564ce2443d40e4920a759ce0b7b256f59. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/SE4U92102308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4772a76c4c7f5bc9ff551547d84441605a08092536c57e51b9308abdd8d6ffe. 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/SE4U92102311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bdb06eeac89974686235a0ded181f322d840c6fdb06030620bd675be8d17319. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZHN32229913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x677362b5b289b4f63ea67dd3624ccbc820bd698374c603231a1560d510f252bc. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZTAU2296001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf87508bb71cebc88a4010a227ce59d7a14783e240d2e2901fa705107b31d8483. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T14:03:34Z), 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/QZTAU2296006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe297d692b3be23afb1ea7cdfc5d78741e82a8197134f14fe7f23b9232bc1ddf6. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/QZTAU2296008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d3c75d24b793516fc79c0ae352d4fe1e22da0bfc7cba7350fa49f00e51d3e1e. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZTAX2261490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x458df891a613e759e5d2fe2edb6df7f85d03d8c108deff5f659522c90ca8657a. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZMEN2375800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x850033dff664657347a56279abfca987b19e8a28a6b735a69fc40dc5e020f200. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZFYX2496635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7034e03ca4f202a15792776b8f9495db5e0ef90d1c2186b2203444e4c7c574a. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QZDA62415989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d4a36d07d2fc45249278802c5fc9efc1f3d09ce13b39e1bd44e35db89c6bb55. 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/QZWFK2455115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4a1d202775dad239b7ac6b290a197b35e35977cb5d80e4b9c72307fa8de49fd. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZWFW2438630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3264184c1c1b6fc5c3dcf26d27174dc3f9991b228b9793e9cb01fc7bd690f52e. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZZ7T2405053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a33ec26f5942ef2090d5700f10950c4afea897e2671e3b10b18d697bebccd2d. 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/QZFZ42524329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93450a73edbdd066c1203dc02f97500ab1c88903fc32633387593bf05aa1ed63. 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/QZHN42541450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9c9d9c4ea47feaf7d3818c5723142f601cef72ad35fbcd196a8408a40739aba. Chain 2 (Bitcoin): anchored in block 957776 (2026-07-13T00:05:10Z), 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/QZNWR2512597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19cab72857cc0bb4b519b8503b0383bd9b19d36764d43bc36c0f0495fa2f49af. 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/QZTBC2599087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc32eed52fa32456552c16f7f2e50be87e08b855edbee4c81a8fcd1b520714ebb. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/QZTBC2599088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b0793d07b2fbb126277ae8be31bbe75bf244b1049706972d45889dc187b894e. 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/QZWFH2529763.