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 0xbb237dd59f37898db771ce48cff7d0e99b15343e3cc2d483df5754a364d9cc19. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6025257e-5080-46e8-ac81-3e087ad1c3a6.json and https://artists.proofprofile.net/proofs/artist/6025257e-5080-46e8-ac81-3e087ad1c3a6.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 0xd0f2f8cb944da27ed1711e424899f13a1e0102653b575bda86e43dbbaca8d0e1. 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/QZTBE2400871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d1262915c10709bc055fd656032d17dd748dcb3c00b52c4768c0b0018805f7a. 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/QZWFM2347554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x727683676351a3f092ddaca223f04c9da0b738555b2a61a71ddc1adc1cdb6a10. 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/TCAGK2283826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c54ebad9ab742e233f6de662a8b732dad4adf309bfbe6480c83e99509fac30c. 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/TCAGK2283831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6528979bc405d34cfb8f38aee573d16f766fcbde4058dbc6e603253698250847. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/TCAGK2283843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe22281a0ac1feb68a4838c9ca365673fe36d8d1f4b2579e417a260be3aa01b86. 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/QZHZ62171488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x578002f8e3932a855d9cbe9bf8d07e899ef710e80c987d5b1d96e3f8301bfe68. 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/TCAFH2076867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c4c3eaa7aa4dd662a254cc197e747c8acc3841f3e636832ec7ec876bf4fe2bb. 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/TCAEY2089422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d7cd8e4c2c9bddb0b97d9813fca7db5efda20f19779e1ebc11da87d1731e05b. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/TCAEQ2029286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x167dbdd31bc0918fe10bfcd9ee63d92b36fe52e5a473b811236e8aba3990c97e. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/TCAEM1901775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48fd4dd25fde00b7ec0a17bd19ff73d5ab3b1da2bb9f03f6a784b5be5e78c077. 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/ZA56E2305777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa11f808f1938f9b9822020dbca7265a0068fb36b5f7e2d61a0b19c78d08c0d3e. 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/ZA56E2305778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ed44b7872df5d6f365c4952c08340f539903061e47a9401e6c8c78695f5aee7. 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/ZA56E2305780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa6f65947b12badfdfc41bd11a771786580dd140a3db14fe98105d87dffa6efd. 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/ZA56E2305781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79a1107568a3262deab5ec4b82bf68e405ce00f3d9dcc8dfcf870f76c50584ad. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/UK3AZ1717131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c9c6308f9b276c54cfeaa55115103dad72a02dfe360cab36265d2e0acd82be4. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/UK3AZ1817825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7588df561f53f855fcf6186938a5970d8503629cb061acc41eda145f3c135c14. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/UK3AZ1817828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9ac6ad22f765a3170f5a142472e74b4a451bbfe2c90c2925655f077bc9f0d98. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/UK3AZ1817831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x956c0e40e14d7fcff8962383f6bb8c66d3999afc19439b18b8e855e94ec2dbbb. 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/UK3AZ1817836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37d6153ad52405ba4ec44161895a90a8eb2cdbd68d3347adac6d87951166b6df. 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/UK3AZ1817838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd400f3efc522e86821ca0ee3e6642d0b648c7286c20aade3c97c2d7e670f3c1c. 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/UK3AZ1817839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26fcba92fc153f9aa2e9f702e1f5930d9bde0405123695babae9262859c6e844. 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/TCAEM1994661.