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 0x622a814edf813745897b1a3a5f435790b9428bf6aec211925ed61ca1b2940d95. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8175bdf5-1b3d-4e87-ad75-178e42ececf6.json and https://artists.proofprofile.net/proofs/artist/8175bdf5-1b3d-4e87-ad75-178e42ececf6.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 0x6c620b0c56544828e3e47499ce0bbe04819ee0c5f41bf48e4c2f648fafd7eb0d. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/DEVF11700192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x163e104a0d3eb71c627136afdcfde9c83cc8d8442dead9aa536e0fec84e9b664. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/DEVF11700180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c166b91164e8eb1def08d223642ae695448406eda89d9ec90192f3869bcca74. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/DEVF11700181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80d85d9037aa41929e3664b669cf5cf74fd6108948cf979cb131c019ea702c6b. 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/DEVF11700182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x794f8b78ec1381e2830d881ceb407dce60f0cd05a0a0ab1ae81d7d8ab86fbab0. 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/DEVF11700183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3621c0c1882008c19fd022fe74b572cf7ecc9aeb91c652ae1f42a2adbba0922d. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/DEVF11700184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb53b41b35f6200363634df8e7f9477d7a2a09e02ce6dc457c001340fe7ac80b. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/DEVF11700185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb23a7302439097c28cc001fff5706e522ccb1ea73516bf073bc70d4cbe059838. 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/DEVF11700186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0322bd1d40c7a7a907a6f5717664159ff0afd3cb9de727b888d378c8a0ae58b. 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/DEVF11700187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc4c0d4d2fe83c040f787f7c86eafa4023483190474f139cf2879a0d0afdd9df. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/DEVF11700189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x009aeaea9cda82863ca71bceb434c4257deaed28883d66b3c5e67eb6e2a3daa7. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/DEVF11700191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb69be3d6a7fc83ebe41bf82b9b7b7cc9c9143f6aa7bee819493d6cdd7ff7da43. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/DEVF11800473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c620b0c56544828e3e47499ce0bbe04819ee0c5f41bf48e4c2f648fafd7eb0d. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/DEVF11700192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb69be3d6a7fc83ebe41bf82b9b7b7cc9c9143f6aa7bee819493d6cdd7ff7da43. 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/DEVF11800473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd444a85075b52523b015819f7e11874dae38f65203a9492cc8d1e3f45fa3ce7c. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/DEVF11900517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4e2ddba3bbbd9ead8d5cc75264efc05317902ce07f7e3f3b04e8256534ac312. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/CA5KR2109963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe69bd16adbec56de355240208aa52db219ee959d07a4997e960b999290b97d0e. 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/QM42K1978372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7708ca9b7b04c8fe6686e8bf18546ce55cc05fadf0fc933279b2dd56a7d7782c. 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/DEVF11800465.