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 0xd9797ccc4812f0ec28890637923daf9ebeb0afc1a0f455d8c2f25bf3c2390235. 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/220ee3f1-71c0-4c7e-9e67-974d2a2e517f.json and https://artists.proofprofile.net/proofs/artist/220ee3f1-71c0-4c7e-9e67-974d2a2e517f.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 0xe55e465964bb65ee85bedb9b662c17570d731c2ac397ce556becea38f84788d6. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/USQY51498345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef4389345bd8405c3f5eb78f0072c357e65f3341fc99e00a3c7e0c0ab4d5de90. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/JMA271700826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ec8f458cbdffbd1dae5b6caf8503f45b45e3a5ba26a088bbed5269f186cd6b6. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/USQY51757730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdad6a2880683268f0ca7b294b740deea80de5c8e0aadb5d185982b2768bc6a47. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/JMA272005013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba2c84e912afc713743bb495ab2389bc39c6104e0145f4923c69e7a44a7b1127. 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/US7VG2372271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec08a98e13c227d0eaa9c869145ae53515983413fed638926239b75065f40ea1. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/US7VG2372270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x256b54a3d09e0e42d7b7cba3fcb0eeba22ef23a4c9b264bc45423a4385326e4b. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZGLM2327625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x563db3e1aefcdecc1ab052e3ecfe5e6916cfe46db1e8a3ddb65db729cea1ccd8. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/QZPYN2461925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27dac20109a143f7a788bf3fd1df3a3cced1c29a23a5b24056360fd18881d475. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/QZNJV2445384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x462bae65850c81e2cba8a1a7b809918b066438449f314fa706657e0c74c24192. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZGLM2502226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa742d5693fb47700c99775c1afa7de8647ea0e77a059544bc018addfa06a1762. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZNJW2503027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9c1deb6498a395118366d3d24c6568c4c8c1aab98ff26b47ea47f728b4e1726. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZNJW2529676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52411d2235c0c53e5d7dc3b5b92a4e229c59d5bdc7d14f65874e911c46fad0a3. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QMFME2572709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27dac20109a143f7a788bf3fd1df3a3cced1c29a23a5b24056360fd18881d475. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QZNJV2445384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fe674952f1fa428a9d749ae4a63904f2f024e0bef5e347345046aa4ce27c254. 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/CYA072100010.