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 0xfcee0fff254c5b1045579d2687ce4beedae4c19419c62f726cf3653b922b0e5f. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a3da256e-184b-4f41-94e9-9beeb717f8c8.json and https://artists.proofprofile.net/proofs/artist/a3da256e-184b-4f41-94e9-9beeb717f8c8.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 0xf12faa846ac60cf184d9ae6631870710068bde5d4eb4d224e601a4527e31f2d2. 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/QZWFL2592178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x936f3f9261f89011f41716307df9c287eb10bf477ec386ad15b1d3883c2a9382. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZWFL2594506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae07afbf333ff533f33b1fc3de52a872341ef451c253bff2339f9a4b50e285ad. 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/QZWFL2594492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26b3eca07f55b1e7d779858a1c8d300178d0d7cbfd15d93bac314051bbee80c8. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/QZWFL2592167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe14fad6fa8bd3d1faf91da915a25576ac819c85c570cfc3e3222df8874a9f01b. 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/QZWFL2592141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x873cef92ddef4b7b8a004e120d14182778c552693a7c2e4579fca399fabf48ef. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZWFL2592166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48fce8a882746352c825dcc4c6c848eae0ae172e072eaf084a1fe2c3c84fd330. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZWFL2594490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60ce7e9170d9c23c0346b3ff2704d0c4f7a9f76da9b64fd502c7c8568d4d819c. 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/QZWFL2592147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b48b007e869c86a2fba5e7c10a3ddfbc11f15e6c93ea76668c206d78c872904. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZWFL2592183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d930ff9a04d5d71d3b83495eefd61676cf156033bf81fcb6cd78844e3ee6a8b. 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/QZWFL2592153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x877e00c9b7810627aa4ce9618f2be5b2070dea996e4d75aba06d699264cb376d. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZWFL2594487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87e00455ebaa80d5de55e8a289465fdbaca176066886f98b5a4ff9d2335a0a74. 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/QZWFL2594488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a4bdc2a1bbea5e7814b708361d0d063f281a981b33aba3a1abb0314014498c9. 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/QZWFM2535969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb2ddb5244aeaa6d17825a5f61cfc7d5a289e1abd88eca35c3ac4178a9628483. 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/QZWFM2535984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc031ed42a0a14177a2271f57cd9bc3746f5f827197dade61a8bfeda05bedbd17. 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/QZWFM2535961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d117285ba7792ea1a77fc1dda9389bf25ef78ccf84c1adc2977cebaf573cdf3. 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/QZWFM2535956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd84651e70d97cbfb6940a3c5b85e0f5b62a701e7cf189b3ce7dd325a2e2bd46. 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/QZWFM2535949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca4285f96e49491ba77d6eff64ffa1f387d498e6da98434ce6e39cd979c3800c. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/QZWFM2535959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c16143e168b5c6cac6d0716e33d0664871352f9d040d5df9ddc684ebb1fc21. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZWFM2535946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5698dddce4fccd297b60e2ae1c6ec6b8136df64b591fcbc52a255e3e03c6a325. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZWFM2535982.