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 0xaa5b629c33795a7342f1bd3824e8d7977787b4b23d9586e7ccd1206bda3cc026. 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/d110132b-d9f5-4a41-befb-9ce0ac749677.json and https://artists.proofprofile.net/proofs/artist/d110132b-d9f5-4a41-befb-9ce0ac749677.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 0x87e1181217a0c45c35c94253deece995bbc1bad69e46fa09cbc2e9456f4dd10e. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QM2PV1543022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72b6d41c5b6938084f57711bae724480918f2b95d2ecc7d1a92f4b02e3a5222d. 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/QM2PV1543023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35ed6421f9a8f4a89ec2ca4efe764c65cc73036b14b0a851958483b2e9acf0fa. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QM2PV1543024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x260ab8171d78ef30bab1a1594693f8b9f3faa0384e840a1a6b90d6bf6722e9d0. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QM2PV1543025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x353560458f5de369a137b06b88e13d2e5c9f5ae3f300feceaa20bf37480ef195. 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/QM2PV1543026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x569e081e74b312fe6828d8a3b29d8c01693b5ddec55b259becaa84e803cdf2cb. 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/QM2PV1543029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe423560ec67d3e6e663753d502e62c5074f4afc6db9ecc63fc90504833e66fbf. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QM2PV1543030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f36717c5913d69fb0effb88f742991c765c8f83928a06c26af180588e517cd6. 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/QM2PV1543032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96073e706d3457e9480e7f80f5b6e11289af12b861292b43eb4bd01b37813945. 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/QM2PV1543033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x960d485c3377377915902ef6086cffadd007d31d14c4242de2e3526e41e8be2d. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QM2PV1543034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88488cfff0d79ac99c7ba273dfeaefd0cb1a2e6dec7d2de02d00a6fbf6db1d6a. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QM2PV1543035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2320511a55344e81022dbe5f11e082ce3cbcc92f62ce9344939274dd84de859. 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/QM2PV1544228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc738306799d51a370b363ece9e8d77773f570b9eefc7c4c722fa1e51d5420ede. Chain 2 (Bitcoin): anchored in block 958658 (2026-07-19T04:09:09Z), 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/QM2PV1544229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aa3e3a117d5c87f9762b4cfc132d297fddccfb491bacfc9388e52249f52d68b. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/QM2PV1544231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x548a9435f87a8d0c0f04577466669117710bf876ee0633546a212b86098c9574. 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/QM2PV1550780.