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 0x77c81c83bbdc9bb6ad532728f02ba76c49ea9e18576f10dc170f7c24589a9700. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a37eaf39-d43c-4814-ab0e-3dba6e070ebc.json and https://artists.proofprofile.net/proofs/artist/a37eaf39-d43c-4814-ab0e-3dba6e070ebc.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 0x25e53f80a92ee4f582fd95e3b409f04b625614b40c5fc72802bacc0c9066308d. 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/FRX282012310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa40d1123df67935a4f3c11d48e966241045f25cc88cfa969949bf22097051471. 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/FRX282012311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb737defa0d8a9d3bb9ba505fb3f8b320cb288ce8d62eaa60c74b09ccd00d99d8. 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/FRX282032765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71b1eada9ebb6216544a2738c901098bd209f50ee58122871f502504ac6f51d8. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/FRX282032766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06508c12f7e5383d3a0f85edfc6f698d443dc88577da4ee45e246a81a2f37065. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/FR96X1913375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12273d65ec6addb4d524a8b368036a0f39fb078d5baf532c123710f91bc5bab0. 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/FR96X1987777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9da30cc9cef19dd1fd92c07161ca38a2816cf36291808d7be97a815d26ac9bd4. 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/FR96X1987778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f519fb86d305c7dd41dcdb2401c7e465a37e45d78731f3205611c4378b8c5ac. 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/FRX282084683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf790771cf57ccfa05f5e86f7409dbdd0d63b5421deaabb2b9376b8f76daa744. 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/FRX202093518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8fd13e8863beed3f5d32b08d324822d5613ef6d7d36a98849ae1b4754c90beb. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/FRX202093519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fbd593f4b664be92aa8386eb83ddb5748522b4f9573ec34e88b83b681e51373. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/FR59R2051087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x168e709eadac0e1ae4afc91e8607afa71309fb7dc9cf67bfce65a189702cee9b. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/FR26V2080957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38487acad8714493a4d2bccf12bbface79d28807d7a24d822a1e8d4dd247ee10. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/FR26V2080958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cb6e2389337fd638965ba5d12fd60a7c336d5ca2d60e83dfa65572dc8d78cb2. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/FRX202194036.