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 0x8203c7c9714292973ceab28088304d0937ed2302dda04dcd4dc08e714bf9cf4d. 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/51ccbd75-e038-4d3d-a92e-16133a0dc50f.json and https://artists.proofprofile.net/proofs/artist/51ccbd75-e038-4d3d-a92e-16133a0dc50f.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 0x038200140206382ff5f92d5b6cfb8b5f43f5676510a5f6c6a4837cb8f5943da9. 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/QZDA52232688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e6e7d33ca0ddbd5b74ef9874f7c1a5a0b609255fc8d2ab7d7a3311cbf54d07f. Chain 2 (Bitcoin): anchored in block 958722 (2026-07-19T11:03:50Z), 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/QZDA52232691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x783fe2a93ba62531c6186c534faf1ae4da6baa00e20105ad11e5a6275e80dd35. 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/QZHNC2253452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7990fe4b1be4fbe26f6e5b6ede8ed5d37b1987505d4ce6b8219d41c49b5b1313. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZHNC2253455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f55f14a7b76fb9ecc20336ac8d048830f063be738f890f4c801afc52b7f8e64. 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/QZES52307851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0b7e7eae3510600f2c31538b54bddb3ead2f4040ac915677f75569e9f988545. 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/QZTBC2300615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cebb9a572482cedb9777375b867e409b1375ad93d6af194a55ec5a018415f6f. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZTB72494332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d99cc9c5fbb778d0c9a5bfcfecc8bd5daa0206e21e26a126abca00b3ce222d7. 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/QZHN72505644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05649e725f9f2c1abefde9f3e32faa228185b9814b63a0e61d6fab3aea17aae6. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QZHN92505864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe03263aebf9c6f022b8c2f6a38a56c4639742d0df17588f58f0dc1d492a47d79. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T09:06:44Z), 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/QZK6L2504225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b62fe17093dea70921834726545ef66758af90f1b8a6f353f2a5f225c367404. 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/QZHNB2005291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe20ef7b4653bae47e9f6229e6d7cebfc2e0b673870670a355be8c32a032306e2. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:16:20Z), 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/QZNWX2245868.