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 0xc899af45b36cf7a194969141cd9dcb5aed4bdecfcd5dc4670b1fabd2aca3745c. Chain 2 (Bitcoin): anchored in block 953782 (2026-06-15T12:13:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d543d2ea-f3a9-4294-b2d4-9f6860e82a90.json and https://artists.proofprofile.net/proofs/artist/d543d2ea-f3a9-4294-b2d4-9f6860e82a90.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 0x235f72f3247f30dd03114f3390f343a84d3f7cbf3f8449a1499bae36c3dbc044. 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/CAHQJ2545352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eb844f82364d726436914ce7cdad85935ed0546e1fa61ff1ee5cbb22d8a1a45. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/CAHQJ2545354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4464b1f0c6768b2c7ec0a6fbfd5badc6a022c0111f1361cf6a56d0c83b7bdba3. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/CAHQJ2545355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ef94717659bc01b8887ef63f3a0beabaec90f6bd3d7b89ff272c39f17bc1222. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/CAHQJ2545358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38371fc3704512b60f0d6d528c201939b7fd9d8c6bf29d3e6e5219a4248015fd. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/CAHQJ2545359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa11ad8ddbee28b22cdf931258b506e05b3fafa50e6d8a53adcfa5fd188e0debf. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/CAHQJ2545361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4827cfe6cfab280cb132e16dded46b738c728c6008054dc548dd7da1704dc23. 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/CAHQJ2545362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x339aaead045bb3d161e2a73da14eed065594cf4f519f5761193150d12f292f87. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/CAHQJ2545363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b7a89e8c3ffd5d21948c2c4615f70cabee8ddcbea9672d1abe3afbe48da62e9. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/CAHQJ2545384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3af8f43383730a42100ee494be33273e21554e23d1694b08770d8a34f01dd341. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/CAHQJ2545390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25ee187b5d050be4128977dc7b58f0ff819739ce373d58b6c6c840840f0b4144. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/CAHQJ2545391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b767937d32bf2a90db054c30ae804b54c7c91e2ee2c5ac376141312dbe3e6f8. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/CAHQJ2545393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1edf760d4dc9ba36bb4dd068439c4820530689247ee70878dfec5cea6dfd16d. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T07:21:40Z), 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/CAHQJ2545394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd83265e070c180bb82f55f3217581f092190bc580a53ac39279b6d56d9bae57b. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/CAHQJ2545395.