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 0x1f6411cb10c952df78106bd435fbef89679d5c15ddf0ccb7ec9694c0dabac9a5. 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/c0cc7284-a0a7-4121-85df-a3146bf28e6e.json and https://artists.proofprofile.net/proofs/artist/c0cc7284-a0a7-4121-85df-a3146bf28e6e.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 0x23f1d22f491e334142cb01f3fcae8beaa82a39b700f02d0ff7156e3d233e0582. 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/ES71G2210665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ce01a5fb143f960e4b3dca0a434cd9647554d545ec35c6e5be8a0632fffd39c. 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/UYB282107019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c4640cabf6639f7f0fe78675e61741c704463a63acd04d8d04d973f18baa1af. 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/UYB282107014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c4640cabf6639f7f0fe78675e61741c704463a63acd04d8d04d973f18baa1af. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/UYB282107014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x891b4a1abeb344c1b152631f8fa0d0003c6262c3867ca69a0c4aeb263810bc90. 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/QZTPX2111487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb14273f8fed1b4c3a5fe956f8aa5bc343330f49982628b99ff0e06dc9fd48ab. 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/QZNJY2137424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d2c018ae71bed6b11e54ac2a01d11dc99e5f0fe29a674cf5f0b11c7041abcb3. 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/QZNJX2368415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ffb757a578194b1987f1d82ab21892c507659cf1fb543d44498a5170284fd3b. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QZNJW2390696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72798cbbab0826850a1611395db606388552332c7a053cf4f1070a41ef5e23b5. 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/QZHZ42248769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88ce8b8af537c0588bb298e1221c94856e467154b28034d86662a82fe031c874. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/QZW9M2289910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64cc0a051f62db6556a44ce558b616067f4cad2278a65666de8947dc4d116272. 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/QZW9L2254660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c55ab20673dd4a2aacb8b86112db5d6a5ab2784f9466c8242c8debcddcb79ce. 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/QZW9M2289911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a6d27b2337812d8d99037a01b5f7d43cb8bfdc72d95c1b2d29d7434ab5e1045. 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/QZW9K2273789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4d87b6a0866f4bbdba797ffdc02a55b586118f9c80bf6cbc1efcdaf04f5a223. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/QZW9M2289913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b9adc50509bf79122930f58c5227e0b83df6f1dd945884bab186994344c9272. 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/QZW9M2235152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e8bd3202ec0e59954e4d7444afda4e00932887002dae165eb49f7e624c146d6. 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/QZ5AB2315184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c4c97c1188ea935d0d75ae5cae2ce3c732884c893406818c50eab7d5dbea48. Chain 2 (Bitcoin): anchored in block 957084 (2026-07-07T20:41:57Z), 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/QZ5AB2315186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88ce8b8af537c0588bb298e1221c94856e467154b28034d86662a82fe031c874. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZW9M2289910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64cc0a051f62db6556a44ce558b616067f4cad2278a65666de8947dc4d116272. 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/QZW9L2254660.