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 0x8f0b03c9a6f944601afa4b38f6b18cf87357292cc8087b4fa9b24400d92c0869. 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/0a0d5604-0290-4018-aac4-f89475a1c233.json and https://artists.proofprofile.net/proofs/artist/0a0d5604-0290-4018-aac4-f89475a1c233.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 0xf8cdc07c8ac2f8b9a70c49f90fc9038c6629481a4181b01719f71a94b16b58f9. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TCAIO2428546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31c879af4409211bda46271cc84a360e5119f8ea2037ddaa2da1def60d871802. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/TCAIK2490542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1552124e090a0674d85ee2372984199cc7bb49c027f1dc90d48e5e955d0e188f. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/TCAIH2424081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a816c6b12b9aceb1a3e2bf501e69ef0712b43b036488a8a6c470055c0316e6b. 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/TCAIE2450073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0838f6a811d5f113dc367d974c361ae41a83a2e67e7b11387e654434254d2ea7. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCAIB2422907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x464a56c966b77b15ebc9e9992397de1b737f38db800b3cf8ce0f13189fa7de50. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TCAHX2493256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb89f0fcbc1c465cde3db05e9f69264146de03c362ccd96b6d621d04809dd6000. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCAHS2323081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8fa1042f3b06066f8c9a4acd11abb2ec0019b6f9464406a87e36ba912f21239. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/TCAHQ2367082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17d84583db3ba533152070288d55af57b8c91001099ef926ed26d612d39f5431. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/TCAHL2336581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83ec903bd95145d104372266ba2cc5ae9f3df7bc2d1584363f0477f5b51f6a85. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAHJ2344082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44248e88f8297fbd7540092e849a8c0bb6a11bc9818c9c867c8e3e751eefbd69. 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/TCAHI2334663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e8caaae853517f6137185aa63cdb55db241b678d802db9f8569b7da0eb9e078. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/TCAHE2311537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9f8f3c3c02b02e2e306682a750f6401d13b4744b2b7994df98b8591db993582. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/TCAGK2261889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fdad2cdd880208728fd375530d9f226a1e3658fe533748073b1e771edb9c756. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/TCAGI2225780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x451e87b48855bf10dd85e1e8935c63464879f0e858188573b1fe58269dde07bf. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/NL4NL2209083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x613cf52f1ea55b4dd670b14db1a17519e241adfe451d73c8eca0fc8cee5b15ee. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/NL1AP1934649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x391c41951b2d19525449da1d960cac2c4069d272a4b7666a7cad6e27db49cb6b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NLS6R1866603.