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 0x7f8116a5b3d08310251f88a6fb2333e10628ad9fea14486193cd33f2f967557f. 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/35cf42bb-0caf-44bd-ba78-af5157ae3160.json and https://artists.proofprofile.net/proofs/artist/35cf42bb-0caf-44bd-ba78-af5157ae3160.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 0xabe20c36652ac734724ea99cb48009a90b25d2858a56de31d77c2234829bf74e. 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/US92U1905861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef1a45aeb56a3e02e1be32f2b2a435e6aff3bd8f8c93f5bcd6bce7b02f7e6b5f. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/US92U1906521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0260ac04deeb53b230ea6a931a8bf3c923c005261293ed5d9d4cf4ef8a44223e. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/US92U1907005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf59abb07a76b4adb0fac6bf89c5697835c2b33dec14ff4fa2cdde5bddcaa4e34. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/CA5KR2373792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b17c3f79e5936cd5c9b8ba859e9332fbea51609281bc04057ce39b6334a98cd. 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/CA5KR2390911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72e4adca061802eae9933049b8485b81e6def41c2503384d2c937b27331e94fb. Chain 2 (Bitcoin): anchored in block 958126 (2026-07-15T08:17:14Z), 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/US92U1910611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd034c5c8a9ff591a19497c10ad5c8a9bf64058c6c779db6ceaeebd3feccc632b. 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/US92U1912759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8fea94716110663903ce3954496d3d20de383e349ca8fc0a26a23a0fe85d67a. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/US92U2400317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6cdad1a5d9702eb7c9f1742c86e22c9d50061c1dd95a7ebb4aedad416076ac7. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/US92U2400318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a4b323a7611ac888d225188b484934da401664360043fcd3a6ce00ddcfd7dc2. 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/US92U2400319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c62cb0167ba17ebabac17eb3406906a1407b67ea2abeaaf15c343dabe43d088. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/US92U2400320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf43369192c805aa7e74c4547495c880de8d823bde0f2a8718afd30b3acde9be8. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/US92U2400321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ae10d91b60b20dbed43a32a3ae44295e547a9ef9c17fa8d3de8863cda6de5ff. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/CA5KR2528168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cf282e87fb4f8427257554c01efa3ddeac40b379292bb537c5636d472b751e5. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/CA5KR2528169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe548f3541509659c6494799bc77bee5e00b63689c9634d23af75c3527377f1c. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/US92U2501198.