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 0xc7a84a9f318358ddecd058af1d2599b045fe494aa5b33f208bc768e1946a683f. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5b5a842f-9d86-40ea-85ee-eedace840a9b.json and https://artists.proofprofile.net/proofs/artist/5b5a842f-9d86-40ea-85ee-eedace840a9b.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 0xbe9343d0bb0181715e5a0e0c6ffa866124c6ce5a93a9a3793f3d6d06437f2861. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZFZ42370479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2966dacaacf259e0ccd4c577365e3efe701a353fdf5f444e9f4b83cf89cc7d27. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZFZ42370529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb937ccbdeaf120774a5043ba18c416288f13440ddb653fdd71e7c3bbf18b583d. Chain 2 (Bitcoin): anchored in block 958496 (2026-07-18T04:43:53Z), 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/QZFZ42370530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ca8bcfe3486c02dcd53784ae23c40941570358c5626f551e00f10250f5b3789. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZFZ42370531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2d3661bb0fc02c8a8a1e53777c21b2e19a5ea235544989131171b9e0dcd3a4d. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QZFZ42370532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0134e26001877ea199e0f6288960e29c0fc4f69b3369ca7083b4ad0d49563b40. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZFZ42370533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa844be0299176b7016268452667cc17d178afda28999552f85f6a864d3acad81. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZFZ42370534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f2075df1cb4f47e63025766973e9130f484b26eb83e638cbad8d9b741c296b7. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZFZ42370535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a29f95c6aabc28285cd1c52927be4c5fcff17f27bab5ad407d07a0825b252a5. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/QZFZ42370536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe186073de6be755d4da3726a5c6e15e7a236f8a81764ff4520dae17fcb2bcaf3. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZFZ42370537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bf9f1a21bffc433526cb6c85614d0a5bf5ba4f6af14c9278a7926c932a18715. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZFZ42370538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcadf22787c26162bb4ce965edf6c9326ba0aadaf757908ca7ca7a622dc457d4f. 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/QZFZ42370539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb478ec9165498ec8ad29aaacaea20182eadaf2c47a833fe44256c20e5b1184f. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZFZ42370540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ea4efe19d970e48570bfa105a155dea05ba07aedded22e02bb0e9c090964823. 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/QZFZ42370541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4db44adb34d4bd1f822f5f418ebc4b10dcbd79027bd26a7fba44be2640d03361. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/QZFZ42370542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0388f08634d591d812f5a4e85f4c8f50c40aa4979060a4011227bda8e2783b1f. 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/QZFZ42370543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89d28445cb1426205dc71e8d8bba76080adc6622403bf825a53b5198fe7d114f. 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/QZFZ42370544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeb82fd8723ea66710c9b2c355e5366dc40c370cc368e653a71a7db363bf247f. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZFZ42370545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1b313defd734d610d9ce559fc73bbcf0f4b8578a2fcd8a38df5c857130e72a9. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZFZ42370546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd407686df85f163634b11a32eae2f743da51edaced09831a0ba3eceb45594f2c. 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/QZFZ42370547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5867151c82fbb6470c540b31d13ce7923edeec73c05fcf1733991eabb99ffdc2. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZFZ42370548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x250e3173c4fc83de701f4d0b3d7dc0e139e9265d39a437e3c9db09a739c287fd. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZFZ42370549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d90f01a0eadb3c374863eaf9bb3c8e690102b051349f46f4aa93f51721c086f. 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/QZFZ42370550.