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 0x68039ebb3eadd551012c9b9df5c8ebb197db1be23563c5fe30e1282e40b79af6. 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/a3433598-32a7-41c3-ad8d-4bfb8525b66e.json and https://artists.proofprofile.net/proofs/artist/a3433598-32a7-41c3-ad8d-4bfb8525b66e.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 0xa6a445f493e0bcee01404a745e3dfa00fcc614127eab50c8041a4b4939ee5e45. 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/SE5Q52201377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbb60aba0480d7fdbd6bc90a56f2e34660512bfb90080671f986e779c399de45. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/SE5Q52201711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb943e967e91e888ee9bba16011942abef733f9a3f0e1155f1d5fc9a69dd95454. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/SE5Q52200966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30f61473c0b32b7025a7acfed184ca917839bce063859d891d8561d6812ab195. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/SE5Q52200777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x228e812303735ad30657b1a1f9101704cc25a695a500375981d9617a170f8d6e. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/SE5Q52104046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5388716d27208627f4989b8e6d68ee90b0d685b21469bae7fef5b7039e44444f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/SE5Q52103988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85f7ffd53689c6931e32b96faf9be9e32980e353562ec2c85a7c8a6f6c5d1e42. 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/SE5Q52103000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e8592b6f634d19d8642d3e2bbdff2466ddcd90fbfeabfda030875ccddbf7ad5. 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/SE5Q52103337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfccb5936eb80349d67a469712037f86bb6219f5d34cc5fa21103c5ad33b0f62c. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/SE5Q52102495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54d6f96a1d0c6b6f6e6c4d9f414e1cb37d1a3e8ea99e1660fd619e4de151e30a. 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/SE5Q52002465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcab2618c1d20282ce481a3e58f4cad67a36cbf2d3c8b4836e6ef2cbc6d2bd9f6. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/SE5Q52001935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40137c9e61e28e900ede63c5af1fc59dd92b62108b87f575e717b00f80abefdc. 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/SE5Q52001991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa9d38457abd178d38a035557dbd266864e0223012769daffd37c9c97e38af55. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/SE5Q51800734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc1acac40b5bb55540b838250f1f43dfa6af1479a0c38a7c61929f277f1966b9. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/SE5Q51800735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdef711c9137d59de6eb28f271a8e90ef67ead79a212b02e5f189e42305fb4349. 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/SE5Q51800557.