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 0x7d8c30ac0e3d7ff1364b49964605d8368f723f7bb57d20d2cd950faf71a82b1e. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c33db911-46ee-4068-bd68-d2176e5acf2b.json and https://artists.proofprofile.net/proofs/artist/c33db911-46ee-4068-bd68-d2176e5acf2b.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 0x604a327d2950c64ab0679331585f2c25031620e41718266f75aed96011a00d97. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZHN52434185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0edc23c564a98c0f7ddcaa7da9b98b3d432a98cb14d4a0991ebb661310dddbc0. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZHN52434186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x013b163d51c608a1c1228e11eef48ff8cb471f4d39d4523bcc53d999e76eb7b1. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZHN52434187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a5bd7283c0e9abdd69a6713953f150b559cc7cdffd282c2780490c496b13e61. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZFZ22450125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacacf48a80e4a7778b56b3f1393350e3a71a7afcc4ac0285d7998d68cde78a0e. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZFZ22450126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7b8cb3fd933c653c23e2a3b66b2c8dbc3b9da37c5eb3d230b5cd1ef85f6b6e7. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZFZ22450127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e48e57055279992f77593e8c9cbb3c9481e42e18bd205a8f8418fe0c5cd3ee5. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZFZ22450128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33194d85fd755bf219dbb5892ceb46be480dc3b5cd21293ecadb510a1fc14f98. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZFZ22450129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b267b270583e4f9b7e74dccdbf9b3f912d0f31032a6409bcac28befd1046e4e. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZZ7T2490381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1ce04e6d7dc82995caf3d798bc0adbb82449993da8190eef6985665e8d9154a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZZ7T2490382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefcaa0959220d72c5eefc5055d1ffae4b55ebe5ba868dd7a4ced988998bc98b9. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZZ7T2490383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61ce6ad62a86d11dafc495b38dcf2a8f0b3f665a2473d2cc14d801c83da8d354. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/USL4Q2436321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28f957c301098dbd844751d67e0fc584d7b5ece3d35e33e6178b18a8c48e441f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USL4Q2436322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30ee6cc57c6927df20ec3b7d091f8913bb85c413894a22fb3560c12d7c4adfe7. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USL4Q2436323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4996a943deb29746a2b9675c542c11501ee71fba4fb9c5c90197525e9980b933. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USL4Q2436324.