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 0xe0b6bc545ce7d24cdd1646e5274502670baeed519064aaacbe09dd048124ea18. 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/1631e2ec-5676-4805-8597-1c0c48085b1a.json and https://artists.proofprofile.net/proofs/artist/1631e2ec-5676-4805-8597-1c0c48085b1a.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 0xff4b0c7fe07eb780c645db7fc44a881708a40ca2f819de1041f041bf5ff7af21. 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/DEVV92200501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeeab2a6bce50980dbef8cc74b9e2913d58e87914934486220d7b27d4eeda29f. 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/DEVV92200502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x238e63572f3c591b97bdf2a4efdbb9c0a57175fc3e725c6736e88d8a767eabb6. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/FR9W12252547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6163254e167db0f068da584a58e59062d05e2c25f747936701c6f732fb0e2ff3. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/FR9W12252550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13d83f5355d4858910d02de9ebc81733af1de374d62753d1aea057674e9d271c. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/NLCK42226338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x535932edad75c0def0aef9a6c5289bbe45484089d1d3ee8020166830c1ee0b08. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/NLCK42226339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86d10b5087894bea23e38a5a977ef9922c5dd59891cedcceff15bd769dd541d9. 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/FRDX62303210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf835df14181f6eb0ad23abafd96bbe5f2b93ab9bdffe38e21a30411db242f3a. 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/DEVV92300801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe40d736908fe2bbcb47d03e190d2a3bbd095e62fcea3f56374076ba7df981b57. 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/DEVV92300803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ed06a239a25887d9070ca6e6789c411accefd22700f58d6f2b2b88240d3f2f5. 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/DEVV92401002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2545f8d48f3f6e561e47afb9b260eb71bedd87009855a11767597ce75d5a2cf. 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/DEVV92401003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02d57767c28982fb0c92a9835ee263b7602d6c97602a8f4628f9d56fa7769cc8. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/DE1O62447551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0d68f95cc318122ad95d91ec88825b607b66800f4f013c080ee689529528ed6. 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/FR2X42567504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0246dd79187f477f7236ab2fe72d4d2d1f2e7f24a82f88f09b2bd3d6da46c7d5. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/FR2X42567507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4500dbbf55ebef3969e8e2a7f778cd2e4717b7a27488a00ac674c6b36a7c84c9. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/DEH742419343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d4b7899599a2561bce8eb966f57be970debd1863756a58fb344873cdfbff646. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/DEPI82310506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ec2223312e809a6e61faaa88c97953176d51814de7b411d272116e07747562d. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/CA5KR2475977.