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 0xfe750f7c036ae1d2492017e84738c04f84d0222c0695eca1f25c71849f1c328e. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4d1378d5-ec35-442c-929f-9d766519cf30.json and https://artists.proofprofile.net/proofs/artist/4d1378d5-ec35-442c-929f-9d766519cf30.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 0xd93c68489f3d072890cef280ee654e13447212ac523dc6c03edea09e5c5a0694. 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/USHM91391972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f3aa3f18edc71c9b2350455ea5b1d826eaeb672f3dbe5d1bd6a238837fdce21. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T05:09:01Z), 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/USHM91391973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bc5b2836306556883ad0b9e7312c8b6b6928d4542587b48fc00c5ee9322efcb. 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/USHM91391974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7611f275bf9b2ec246a89bfbc41f807f1a76d86b0c32c018d55e883dd78cd9d. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USHM91391975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x524b079db19f21b3a47787c57b872304576e9e52a6f5d049a048cd6472aad9f9. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T23:43:42Z), 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/USHM91391976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a5d9ee35a6a640afbc78349554d14c418a446ecaf451ec67337fc2d77cd2383. 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/USHM91391977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8422943ddee653875b67ccce25340d0b5fff4aa130464fb0c1722916a9e7f4a. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/USHM91391978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c6c6158daf0b9a5623978724af6463dd51556f53cb6dcc151f46f6319561426. 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/USHM91391979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c59b2d4058b28e6aeab541140626654c62edfcbc0e7e5bcab35ab1c5ebcb413. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/USHM91391980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f637541f2dbe6235d7402b961677b9f197373d17dc2b4fbfca87ab4e49724d7. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USHM91391981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x784b9ef325059f9ba29da9a6c3ff2a5d0fe432109c5ca079b38b49b3e98f01c7. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USHM91391982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ea9e64dcb6eb209ef530367e4c4492b9282dbeed111291ea64fbbff655001e4. 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/USHM91391983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8ffd7237c1a62aea5ec6374be286455fc2ba5e0e535c1cb7482b5bfcc25f171. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:23:07Z), 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/USHM91340118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ae81bd66c1af7a21a68c043c3ca396365a6d528b7a589d4bea0373f4d4c1493. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USHM91340119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f3a0b280c0829e0d22d9cfdc0301a7990f6e369c477d5e531d056d8375daace. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:37:25Z), 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/USHM91340120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36e5593ae8702368e1e4d9ee54ac7fee2039b2a72d7577e94e41a95288954997. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/USHM91340121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60e65aaad113394390293099f719ae32cab16801e7861ba574efe426f9d25fae. 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/USHM91340122.