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 0xd851c503abe435c3c353277aa61118f085abc153a063b4611146d4ad45264e9e. 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/4cb09b27-09c0-4e25-9b9b-120aa52ff59d.json and https://artists.proofprofile.net/proofs/artist/4cb09b27-09c0-4e25-9b9b-120aa52ff59d.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 0xfb14846123fb951da3ad8be1f8ac62474638883e1f5a654f08fddc78808b8866. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZWFM2437284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa68184d78abdc54fd8c047229f74030b57d62ef1bec02d157a580cb543f4b616. 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/QZWFM2462117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ba9164a7e1da80cc4f0f346d43d5085e0cff890d992333dd20bfd40ae52f48e. 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/QZWFM2460744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x609345364290d037c1a275e95fb1ff355c6580a30d8735f1de03b82e1453bd74. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/TCAJX2523846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x097d0af2474c93a572f51524f98544f85fa2b82e2867cdfb5f99c1c9b5fc2046. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/TCAJX2523718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc9d6c47c45382d3d4b3b09ef83f69a79a5e2d34933d07ea4c1adea19aa19762. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/TCAJW2597662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb573d2268415ef1e85129de8a95f70b756e4275f41b80b5f35769e62df718f79. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCAJX2523897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b1ea137fcbed9de11e77a8b74d797261595e970b8dc4644b0c34333df9df810. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/TCAJX2524121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ad0b976b86deaf1bd830fdc91b55cd1aadbff79a2a7824c76c8fa77e044b68d. 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/TCAJX2522856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef459a971a76a9d23350a5e4a9c8a9b5c7f6a91fdc103352cba366c86de9d91d. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/TCAJX2524147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ccb806b879d835bfa3bfb645ea44f007ea7b872aca8c9f1000b60639ba81133. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCAJX2523491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82876dd7b85f65fcbd610a8ced8c91bce8f08dfd64bde672dc14ffc575a52a98. 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/TCAJY2576192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a9d8dd57fd0a0a922bc43cf76d80bfa231d9509b82587556ba2b3815df2f860. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/TCAJY2583788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27bd3c3960c83b501fff2e496917945b7877c2714f0bd0cefdc1d1c78627436a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCAJY2588396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c97a331252b59eeaa7cbfd257e1bdac00616d36a9de884893f3d346bbf1bb02. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/TCAJY2544550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x211bbc0e75e3ac42cd1dcb422daade6157a895ecb37f666c4adbd8543be3ef10. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/TCAJY2551210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae22687f2e2f9c259af5481f5bfc45fe853c3d625b86b32a6ac8c53f2292ac0b. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/TCAJY2551094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8481f2cdedc77d91c5934b00ae23570fdbbb51eea2dfd8d184f27a7a0c2ac82. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/TCAJY2551058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x936dead7318076bcf859bc8c2dcab4e7bec131ad34843eaa56e6edd1d3ad09ad. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/TCAJZ2520379.