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 0xbd5b3a2dd022091e69e9a722b58d6989f18c2c10b23e61057389a10590cb3104. 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/5c98f72a-7376-4c77-8088-854d8d827a5d.json and https://artists.proofprofile.net/proofs/artist/5c98f72a-7376-4c77-8088-854d8d827a5d.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 0xfd98f3df206a99622591d985bbfa1886532cb5ffe3b6c585b49e358b243d1a1f. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/TCAEL1984913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x821919df04030115e7bf23e6d6b54a5e50a313ad62e5af774b25d1b52e78d30e. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/TCAGK2229785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbcba5481ac2fbe5061be170d54f61caf8efa19f5e383d2c54aaa33394a52ef0. 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/TCAGK2229805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85a4583c536b90d8d6b9482b42ead29451e85880b167ee4f20820c64bdd8ecde. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/TCAGK2229946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dcab725152670523a72be2f6ae60d605bea4342f385197a515e692b6db4fbe2. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/TCAGK2229973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc966d4f2b1ddd242e5993339d83ecbfaabe6d81f0c67df094a6efe8214d8e789. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZTAU2407589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x963b56a6f3537e4c3176e07bd09acfa891f7628e7f6e6959867f2c98590af91e. 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/QZTAU2407591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd2102e91fc831422d113d48a5b6ff810c73ff1e5cc556c08c04de9e3567f8de. 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/QZTAU2407592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1f4af587f74dfb5a622cc9359955279784a8a5481e88ce50dc22dafbf354dfa. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/QZWFU2480369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70e04fd5ac39721f07f8a3f210362e938ca20ec0e506b203e24015c967934004. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/QZWFW2463132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e6a3d9f9af30b66f1b627e811e97227444f7b111d02d9f2c226e5fb0ef51db9. 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/QZWFW2463134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x007ce05eb8c68c20528dfb0b7941e2f61194292523c47073a60bd38dcf52ca63. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/QZWFW2463135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x714d57e38255bb99fb8c32f962e2b3958dd4f9c9cf92cacff4f4f68464d18929. 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/QZWFW2463136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc91a8380bf6a794128ac715d70ca7b5d64b8793f48ab703a11295212d5f2cf5. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZWFW2463137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86a3b11e6330224b9f460eb5526f6dc5f8b2a67de128b767ec867c8b1739de85. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QT3F32542602.