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 0xa193fabf0dd2da300f3a415dc1b9e6bd8fbef59dc05a09dca3e4644e01e26581. 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/5db65916-51ae-40c6-a462-f30864d0969e.json and https://artists.proofprofile.net/proofs/artist/5db65916-51ae-40c6-a462-f30864d0969e.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 0x29e6ca90ef2cd936a12136c8d2eb1da638a96a5551665bab9232b51a053c1b48. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/USDY41851575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bd4755894c430cf14fc1fc8dde8da070d467e8309730971eab28d3c682976b1. Chain 2 (Bitcoin): anchored in block 958658 (2026-07-19T04:09:09Z), 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/USDY41851576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3136028d392cece39a9622c54bc1c2ef056bdb84054afd8510074e6a7cbe8e5. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/USDY41851577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac2e9d64bfb7c3c692e22a56d5d00bc121eeab7121798c6efdc42cbda309302c. 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/USDY41851579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe515c65216a5d30f9cfdc7e16e81aa099cddd73a6f9e099c6fa1701544f8fe3f. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/USDY41851580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc043f5929b9eb6b2bd40b7a61089ec25bc13118764da2df9db89bf089ec41961. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAEI1900582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefee1fdc7a25a01a70db8df8242c371102077ed2ba2564962ccc1e32b4151d7a. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/TCAEI1900600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x159d81abf6061d1ca1ffa4f9ffc9e6e19606b132b893c364d4ca6508be47bb08. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/USCGH2389389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0454609948581de0946ee9935ce8536d28e77efdbdd25be6f34091a395835644. 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/USDY42310773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x538c688d7a3eb592d235803d9c2e00448965d3c05b9fb19dd84955c10425183b. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/USDY42310774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13cf207cf8dccde94d3829ee07a9119a4290bb6bf7957263d95c7be052941362. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/USCGH2425901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bc39bae23b795a5864e5ddfd3091c5ad9825305c6b8b765df3a7b7d4694a5d1. Chain 2 (Bitcoin): anchored in block 959146 (2026-07-22T15:41:47Z), 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/USHM92510764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf85a4387aad70127f9acaaf3d8924c7eb098f40f0b07a2edfdbea05265ee28e6. 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/USL4Q2516240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75582b4e0d573a6176a2f28f0e502fdde701514c5a56a706c0425392ce546c71. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/USL4R2552156.