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 0x8035451096217b678a86299b3cc198af623f5878182965c66d5ecaa7d01dfe7f. 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/61e4ba8b-ceb4-4907-803f-63b80a624753.json and https://artists.proofprofile.net/proofs/artist/61e4ba8b-ceb4-4907-803f-63b80a624753.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 0x252fe79fbd833f5cdff4b61d999b0ff9211ca8a1e263174b5ce9570ac39b6d37. 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/TCACF1586241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43ef9971dea7d0ea87d7af958272d25a50a214f3776ecdf8fd1498fe9a62aa70. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/DEM251801041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f53d6304e890e4e61295eddfcc6560012b85169d91dc087faf00fa431cff879. 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/DEM251801051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcce28499a2ba99a5125072e7da6c235609b811559dc6d85e268198205a7915c9. 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/TCAEB1976197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38c704bdf373d55e0d30e06c72241e4784555aac3b430555b5f990f242f8171e. 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/TCAFJ2119732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55448b5bad3af5abc23ffcf21ba81e6a2ba33fb53a1eb384c4ade4e04e5ff5e9. 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/TCAFJ2119749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47b2a58b4435d3dc5b884bc9a3c5d40a0c4212ec532225cbf9b3987d0ad5fa54. 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/TCAFJ2119798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9a6af597ddb65687b45073d2194a031ccedce9e8c3618a8e123951149cc35dc. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/DEM252104011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70f1bf3b38a03640cfa381698b364ffa4bf916ce2a52ded7779cc9166a8b7db7. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/DEM252104021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x330ec7cb1c7a8b20504f63f5f5955850f5f829ec9e55a8180ee95bb8cec7ba37. 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/DEM252104031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b7dc8255e71974f1e7a6102c61f3e32101a8c263ec53bb5241fe4bd3ed03e91. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/DEM252104051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16479d633c090aee6a194b1575063d22c8a62c2c8552a48b667a22f4dc11d17e. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/DEM252104061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f4ed219938afa615035b51157b6f6005e855019defd576c03cea787a281496f. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/DEM252104071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e3cb37562834cc884ab7f1d9cdd46e4bf123246da8828707a3b535a556d6b82. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/QM6XS1602002.