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 0x1935d25c5e4ac006dca00a0b897c49c63b769a324a6ef2057ed29a5640dbf538. 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/1410404c-37c5-40b2-a896-b1000014c475.json and https://artists.proofprofile.net/proofs/artist/1410404c-37c5-40b2-a896-b1000014c475.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 0x58040b0e307394671bc96da011358e304867b2acb7a1dbf3c15ad9071075d933. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/INS189422411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc0dccbb5392c9b4bf94fca03934bd1791ad46b9f1bf5f53c5fc35aef6779737. 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/QMFMG1331539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07f6b94e7e497e8c9b0c34ea2f3ba12c8b371724cffb6e692e0dc9aac6e6b79f. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QMFMG1331542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd14997bba12b4e39b580c789432b10aaa47c62aa040dfe655c66a4e0fcba289. 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/QMFMG1331543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0c225497f6d631bf3f7d4ae2bb7ec831da9bc0934f1228f385e4ac2dec6ae2a. 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/QMFMG1305287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53b014eb8ca396c88e74f3516d740812caf1549c37ba5e48ea05ca84de6ca52c. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QMFMG1305295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28a28f11fcdddf081960e936ef1fad827f810bdf15f0b171d363842809fc9734. Chain 2 (Bitcoin): anchored in block 957556 (2026-07-11T11:14:07Z), 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/QMFMG1305296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe432f19e5fd137ace9ce6fbffdc507993ffd5993b123a69ef1ad0f03a7d7d11. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/CAMF60600644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd4d7be1f2f131a095762c503af986495636a54852b26ccbf0bd6d1e1d208a87. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QMFMG1312271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84d778401e9dbf6d335b6b8a345b9bbadedb0972f6e87fa855bcf8135bc282a3. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/FR59R1714900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc17b2f29776fc3b93ea643ab3cd64ae32f3e9f95cdbeda822ccfe1f2f060b56f. 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/FR59R1714902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93c245d0e948c48774b19ff09cccaae2c92b1f3246c2d9dca9161136c64f127f. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/FR59R1714904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf09de0c933674c767521a2238928a5cd24ccd0a1a58a1c035b603c63656e1826. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/AUBEC2545983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54061522012963b724756a2750b806ae99f0af1cfad5cff7087a8569b4cacc74. Chain 2 (Bitcoin): anchored in block 960223 (2026-07-30T07:51:46Z), 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/INB802000184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41a336c5cb0adac17dc2b67be053889c16f18e3866e2828a9f7ec71a553360e1. 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/FR59R1719541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x366b0391df708d4f59ed4715e1966363085e00cbd874f149f0212af10a23dded. 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/FR59R1719545.