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 0x610750abdb9c8201abe87e17ac3928e8ed3a4fcabedae09d8e3a1476528b127f. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5fd856f8-ef4a-4aa1-8c8f-d302b37d1d49.json and https://artists.proofprofile.net/proofs/artist/5fd856f8-ef4a-4aa1-8c8f-d302b37d1d49.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 0x9ffea7a22a6f794d80d996fe37f4ac425f75124d5dba52766addea21b3dc120b. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QZNWX2370570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99c72e59834a20ea55a847e3f4d60102cd5887eb59240d4ca85856a24aef289f. 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/QZHN62452249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65da622da81e2bacca29f31a77206d3ec14e5300f0dfaee8134bb5ae7cd5555f. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZHN62452250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3bd6b1afd816764d62b834352d69b51a06967c4a250489a3891f8e5b0e68666. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZHN62452252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf540a625ff25aa724d3d9df8c96a24608d30ba4a5316d36468341cdb7a93ada0. 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/QZHN62452253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7fe243d2b8686b2fb1a5785c706b635dce619f97c4bd725458ca71e6f748448. 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/QZK6N2476326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03b628ded6978a93df848d253bd015b443b6dc5673fd0aaa6de8c4c47bba0f44. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZK6M2479852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7586301a3615633cd409747f76404251c842ff6c4cfda5bafbbe27fec8663a8b. 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/QZNWZ2425278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27e4c7070d570c15c66af16384cb20500f2a0a4e6006663508abdcb2df1d608b. 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/QZTB72450425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82bcf10cb85952e3e568193656ae7b448f5bfeb90aac374129ea1b086108cccd. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZTB72450424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82bcf10cb85952e3e568193656ae7b448f5bfeb90aac374129ea1b086108cccd. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZTB72450424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47c134e8cc9445fdafa003b7ba7c6702fc708884c7db4660dc17e2b66c5ee8f3. 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/QZTB72450426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x234ba40eefd4dbfbcc6b3cc620891df99d8fc2cdf530da810af05599036149fe. 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/QZWFU2414382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb47de6414f08573515d65e172e69e067c19125212d8462369bb7afd305bf9167. 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/QT3F22417886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb509e648e0b32befe893960595299da6d61724bdfe4e5391c028ce194fa1bd50. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QT3F22417887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9468c427dd44ae914046959ffb54400eacf91a7d7986e51ac316c69cdbb34a36. 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/QT3F22417888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb361e1b3fc9d532e1dda6345044d84e4ed467c0eb16adb8d018b76e5a56bc066. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QT3F22417889.