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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53ac04cb2bffc057041d63fb7acc863a944ba74c88cc00cc57a022b75f67308b. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bb3865f3-72bd-46a9-ac14-5b93edecf5a5.json and https://artists.proofprofile.net/proofs/artist/bb3865f3-72bd-46a9-ac14-5b93edecf5a5.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cefdb003dd8bd9354f3076c85016bd452fcc7647beb2bf990110bd2af74d9ab. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:25:34Z), 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/TCACS1691814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe27bcd3940f8d536caf87c3a911f5df87eb26b1827051b5d223bced202ab5f97. 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/TCAFO2140592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd0b9f0fc3a2a9d0d14aca8ded3d3e4b98958044842114155c3fa1246dbe98d1. 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/NL4DU2000163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05bf6912a014c32a7e7b383c47f2a547d805f25c22d950da6cbf7abe1b2b909f. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NL4DU2000494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52eb494a614cf295777140848f3cf9fc9ef443f127423655cc85c4bb5636fc3d. 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/NL4DU2000498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd79fbfa5138e0f51d65ee7dfab08524bbe456e06d52e1770c2f813de037bb4f1. 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/NL4DU2000489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c0b29c4d2ffb7f4346751b64d28598d323b8a4e5fd20238ee7456bdeae52d0b. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NL4DU2000490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec7a6887f793817419ba3c6e12b39812ddd1797a118e96ed8950c3ae62024d92. 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/NL4DU2000362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1222261cc0f07261d3e6f3335ef4ebd0cd9bb3aa2d5367a8dc1d2c16abda0dbf. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/NL4DU2000513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a43a86adaeb0d68ddb8dc1241603d266b1f3229313c02ea4498c0e72c73586a. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), 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/NL4DU2000156.
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 0xb03b8534d06960a9b9361de2deb6dd3783e140f0e37e2ee4f831d841e3372e81. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/NL4DU2000491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85fb9a4bd85c936604656e3f7415ed3526462ffc279b9f4101990efc695f2785. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/NL4DU2000329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e1966eabfc4e9a5d57b907cd0862e6054ea17f81449556e8c7450d4dee00570. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZDA82329890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20d91663b2a2699501712639847a56bb57d6df447f997e4fedfc4e278bdfaba5. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/NL4DU2000420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0833e9f27c0d6adfd9b962712f6d0e9941a9e24931f216fbc76145c10d262fef. 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/NL4DU2000340.