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 0x3f4f40500492b6856b1489562fd03f8aa5bdfdd4f8500e43e56b154151ff8a69. 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/53cab6d6-aeab-4c22-8319-0ea1cc0d98ba.json and https://artists.proofprofile.net/proofs/artist/53cab6d6-aeab-4c22-8319-0ea1cc0d98ba.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 0x340b2322787148a364ed283dee76e967bbc904ecc93925b37ddbbb63617c049b. 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/QZNWQ2174818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e3235128908b87bff25d3c15ca99bb1f3bd4196b62125dbdf3654e55115cea9. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/QZNWQ2174819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb73829de85d8813e633a7285e228de7535abdb7783f20c12af4c3c9c0ad77df. 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/QZHN72240578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f3144d46f8d757c92e054143eadb1c01f05b4a7047a37024a0f2dbcd0cff727. 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/QZHN72240579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a37d6233e5d39a34169d9b40ebdce440379edd0bbcba068d3322f70b0ab2fd3. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/QZK6P2257079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d86b4068c255d83fc860ca7f3b6d95e7ac3a5e0d1ddf3a7dec0ef4ca339b334. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/QZPLR2212470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1ebb7f30816991b2cd003acd7c281b8e22038f24094e2e5eb7f17882b7dd297. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZHNC2335774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa2a2e10c58c20f83bc194fd976997fa3b09b0d98af8f8923e2371c105d5c885. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/QMRTJ2400703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f1881044e3f9fdfc3ca68dd98f126fc4c0864f548e8f2f2e913e1121ecabc9c. 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/QMRTJ2400704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b7944636844298e39a338ca6746c4c5b68e3bda1b702aa3a4e641fe69cddb48. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/QMRTJ2400707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06f7a787df4957dac5b54d3f4f2a7b247cdc3b095c1c06f4738666cb1a0a24b0. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QMRTJ2400708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f3bcfdd212314121b7dc01bcc4b23e34af0bd5634a49425ff0bbdfcdfcb0233. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZRP52597765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ec5ce21a4a9c23bf2fbf1e95c62c5c2a056290973cdcc07e28630b57757e752. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZTBA2502111.