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 0x4160baf75227ffe8712735ca54eb84e8cad95506ccef388397294c9732940e56. 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/74a6b65f-42c8-4515-a20e-f8e3a5424fe3.json and https://artists.proofprofile.net/proofs/artist/74a6b65f-42c8-4515-a20e-f8e3a5424fe3.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 0x822828a88b2a0e06a387d60c7d7c6578b4486cafcfcfcd79d5cafe492f2fe81b. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QZK6J2200954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5085aa67fa52820ee68e257823d20d7f73f8e95193619a9340ff180859d30b2. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T15:45:17Z), 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/QZMEM2261902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb013db4daa6de2657408376620766db83c02185970741e9fa430c9dc4a54ab75. 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/QZMEM2261906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9812ce929c2780147adf39961160d4542d327d7c5eecb75b49581eeffe4d942. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZNWU2240177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c42d35740affe6fec186e33ff44c62e803d8f5e879442533cb7b0902b32265d. 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/QZK6Q2333362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddce5929719377f35739ed66bd785588565b557956b7eacd4ad3d20186357b05. 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/QZK6Q2333364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c42d35740affe6fec186e33ff44c62e803d8f5e879442533cb7b0902b32265d. 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/QZK6Q2333362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddce5929719377f35739ed66bd785588565b557956b7eacd4ad3d20186357b05. 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/QZK6Q2333364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2eff2cb6067234297c0d3a4e75f0022c9d74efaa9766fbec5843762ac2b1aff. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZK6Q2333363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd468c8d8965e54be841f47d04514c5f347d4586848d2216471de6647bac76e06. 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/QZK6Q2333365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cdb7d1571888d1d78b8e01472c01016fdc5f1d25e3be20f57edd6c8f1852428. 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/QM6XS2400064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a21927be5836e1038e937f027e7a2c313a3efbd1d9ea61906c2ee8b77c11fa9. 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/QZNWZ2327646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aa6d7db9bbf1d5a3341cee5be755d09bcdd5d89bc62f5456f362278cf5547e6. 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/QM6XS2400066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79e01255ab277b74ebfe1c2b8e30010277610fa9103529578cee4b1e2bcd5e82. 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/QM6XS2410133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c5313711a6bcaf1fc185be94c51b09740475432a81a0197663992ab2c99a764. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QM6XS2510289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce0d218593d499c4bfb2481408d6d1c179857d398a4ada1dcb03cfda0f8cb3cf. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T11:33:43Z), 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/QZK6P2522102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87663cb4fac4eea8a2e989b391b17dad732b620c7b318266027e953eaa2f7cd6. 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/QZHN52389214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc99bb7336021d18081ad05d24bde8c6c58325bebe947d2fe7ed1d80360b8d144. 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/QZHN52389215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ea387f0599d477a18a424234a3df64ccaa426045889b7b38645f25c42862375. 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/QZHN52389216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fbb902a148dc366c98b2e9b82e99d59aafd55c18042696dbf33c1bed652930f. 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/QZHN52389217.