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 0x8d8875eb09ecd46f9ae58ba054f1b64a1a77f813d0846ec53167118bba5f2ece. Chain 2 (Bitcoin): anchored in block 953645 (2026-06-14T14:31:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3f3dc8a8-482c-4795-b579-a1ff0194c67b.json and https://artists.proofprofile.net/proofs/artist/3f3dc8a8-482c-4795-b579-a1ff0194c67b.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 0x2ce7035c97ff9fc871c37b27e3f72611b47c80040ffd72fb9f7a75f41c6331c3. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/TCAII2493478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40f0a8eecb3c32995d11235ccd282a9b186a8cd0dc9ee139e76f2f03728350f6. 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/TCAIJ2493514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91d8ecde4e2864d3194224ed7f190d027745ad56447b0e3138ad2862a4805a97. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/TCAHD2398372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9347bb50518a2e37d2f43855cd999edcfcbe3f8b1dfaa652bc611517bb44a51b. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/TCAIJ2493545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5938102530fde1959a878ad7582849ae6eba1bea9b3e80877475e4f19a3a8e18. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCAII2493557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x744cb4ee6b7082c0726434671899c805192f30061b39ecd623120df9db602887. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/TCAII2493569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68c55965a02ae3717dea789005e414b10014316efec89dcf312923271ee420a0. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/TCAHH2326705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f63fb56185a2db4db6db886784dfbfa77af999dda0a4704d65579a6080b56fb. 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/TCAIJ2493649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x579e4fd317dab6b2a6584a85417b72f800b6115fac5f6f802c6df6c3d71c2ebf. 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/TCAII2493661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7db47a76f5af1fb11c6d7bde91009e918ea26330b4b6a2373949668706aa4fdd. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/TCAIY2457554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea3946409fc767c590932e9ede49e76d809eb01928b9641cfaaa41f17e12aec1. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/TCAIY2457773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a806bc4e7055e3f99058969f72c3095fe90fc6f63c660a54d1184a49d1d14ea. 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/TCAJQ2595016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea3946409fc767c590932e9ede49e76d809eb01928b9641cfaaa41f17e12aec1. 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/TCAIY2457773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7db47a76f5af1fb11c6d7bde91009e918ea26330b4b6a2373949668706aa4fdd. 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/TCAIY2457554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8235f2a8411a439d93c2a6977fe8bd714acf444153a05efcb6a8b6e7930429f. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/TCAJT2543502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d3bd5ae5e806393504ca7ee7df9a068ead995b80822fa4c0588bf98457b9201. 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/TCAJW2577971.