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 0x674533468d50c78f9976077786ee51bbf19bf2ebfd5f3909a27be9995aa1e841. 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/b8d140f8-2bc0-4087-ab3a-6697dcae3ce7.json and https://artists.proofprofile.net/proofs/artist/b8d140f8-2bc0-4087-ab3a-6697dcae3ce7.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 0x589efa7f489f3d46e78675d4af5a59b908e3e6aeb65aa3026220b87ef834c9da. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/FR9W11922509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2c9decf5250c1fa6745966a5856a1963f8f6c4a7564de60f1d652ca584f8249. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/FR1A91902611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d37d5e064cc5a3cb3805af8d76e842f4f0b89b66ff0f0bbc12ae8f957e38664. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/FR9W12005685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea30842cd6ee448b4e59b5bd716d150468ee043f9db10377c077b6c36490067d. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/FR9W12007223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d1a62cd76d0fda23381ed538baf244555ce25a6772a91a87c99a32604183cf. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/CH6542042406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9417b89fe19ce6866ad3f53f55ee1cc19612c52c246e197741f61c1a795dd206. 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/FR9W12106821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93414d757b07b0e90c012952fe7052be48801b0fb6c8ab0c36a495c602c3f195. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/CH6541682419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85376447f80e21bfb3b05c66f7ccbc99e3358eb35b688dfdf5700a2991f83c22. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/FR9W12146770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f7e223ecbcc5c42dc1ba909002a9774f17603890b7e518e6ebde21ac4a27c85. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/CH6542243310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89ea661d1c3b29c6a74933d6426fa2668babf1a458cc31e04c6f0a857e3d36ee. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/CH6542305572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b601f27e7fa214d09ebfa806f415e6efa59620483d4fde2313f82da93dc8063. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/CH6542431526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb975a2acde40e956fc4942a892fd0ac3937137206290da365648bb3457c4262a. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/CH6542431527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd691d9f7e6298a3dcfc7cf2cfcbaf3738b2be83b922b23f28d8a2dfeb3fac4a3. 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/CH6542431525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6a56b75c79a111063def5a33de5e9e3677905b7707e9e7ec722fb42260ef144. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/CH6542431528.