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 0x5178f0bc3354cd6d381daef5a5627a03732f5c6b8abd07fb5a6595bad8d583a9. Chain 2 (Bitcoin): anchored in block 953684 (2026-06-14T19:51:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/64fca402-6eb9-4804-899e-a511e29c3e6f.json and https://artists.proofprofile.net/proofs/artist/64fca402-6eb9-4804-899e-a511e29c3e6f.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 0x820acc35c966c324f287805bfa7a4e1cdbc717be445be669c39ba86d097b56c4. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/TCACZ1776286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x820acc35c966c324f287805bfa7a4e1cdbc717be445be669c39ba86d097b56c4. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/TCACZ1776286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44d5fe2af5ef3d47f3e4739daf35816cf3f88959cc28c9476341ec21f3e6f9b2. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/TCADD1718566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06d3820df979e3e0a01d26ca4ad7fefa72cd16c69c8ecc34072b608e881b7cdc. 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/TCADD1718589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44d5fe2af5ef3d47f3e4739daf35816cf3f88959cc28c9476341ec21f3e6f9b2. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/TCADD1718566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0cea2e2841d78b86e3ff6aea2bbe6901d32ad002c9733f0c3480f3302a570a2. 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/TCADL1804721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b0905bdf8be29312a79ea1aa82d17bdd3217f91041ea065f68db3c467b64e60. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/TCADU1875643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b0905bdf8be29312a79ea1aa82d17bdd3217f91041ea065f68db3c467b64e60. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/TCADU1875643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x133ad8d40c3371a82e119a915628342d337b41374bb90b0967058de028acf069. 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/TCAEF1915564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb590b1cc7135175aa17ebcc74f3eef8dfd5772d7381aca47586e8b8911bb7624. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/QZHN31997028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x133ad8d40c3371a82e119a915628342d337b41374bb90b0967058de028acf069. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCAEF1915564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71b12ee6ddc9eecaa3d9a9a329cceabdf5b41d535be0a6734c90931c6d611caf. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZK6G2088476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb53e31caecd333edb3082c463117923e3f54392538162cf7e718ebc209d7b46. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZRP52278015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c1df91a5bf160daa353e403b362658fdcee501da2669217a2824c68a3685294. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZRP52278017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a9da80d6eeb89f44ebde45e3d38bfac9bde1278399023b55d21d7e7fe850c59. 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/QZMEP2343573.