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 0x8efb8741945901404dd00b59678692410b96bcdc42792272f0208e68de65514f. 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/1d735a6f-80b2-4aaa-9de1-61a33772b3cb.json and https://artists.proofprofile.net/proofs/artist/1d735a6f-80b2-4aaa-9de1-61a33772b3cb.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 0x01bf0a35a4462896c7591a423283bb8994d4e67b3e414b764f4fe6f6c2cbcbe6. 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/DEH742045125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbce2d9aed0329b0faf884e7ccc3708a03b2b8fbdf1d4b66f592138f0c7a798e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZNWQ2274194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9ea90e149fe48608e0298858e26cc1a33e266f85d47587fb0284b48ca8850a8. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZNWQ2274195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0a4c87d15766e4ae1c8d31fb5e4dd488e07cf1eaf586c0f8bc62bc2521090bd. 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/QZNWQ2274196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e57b1ac3f3d241abae858e12c999d58322477f49f8f52410022e9f37a328a6d. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZNWQ2274197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x586e4d7ad7c37ec228d0d9bcbaffc145fe9f349c9cfcbc52ee17200b7cbc3d79. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZNWQ2274198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a5ce4c5939314728348fd54c8ee6624041ef4809038e7de2791f04cd6cc3c30. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZNWQ2274199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x856ba3d03ba09716ad1e6e43bbd5947d3fd220a8071ba0e380368ad21c808b5f. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZK6J2318326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42778730163c8d96201420fa6d019f800fcf0a00604acc73342d3a3bc9699472. 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/QZK6F2364848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe55253509d17b5070446d6a99aea44c482db1e3d2fa4e2881aa89183ae07daed. 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/QZK6F2364849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ec036b67cbe7d8ff0021c5e914ec6b2de206ea8673525c540a3ee5f3030355d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZK6F2364850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d06d85afd331a243dd72fdc9115bc4e8874f244342bf3e7f5e67947316763dc. Chain 2 (Bitcoin): anchored in block 960231 (2026-07-30T08:33:28Z), 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/QZK6F2364851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c9691398b436f0ccab747ba86d2ad063db22407d2335a545cc98928bc1e1e6d. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZHN42492262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10f3466b2b32afb3d137fb507f0d3f266df09beaca1afc73b867f7b11e279670. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZRP42463161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06ec52acc559194331ee11bf40f32155c7246c3d2a738a9d4c47d9a6b1ac98d6. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZRP52431682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf113e351382869dbbcab9350d8cac6dc188f389c6fb031f151bbca4a9e225064. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZRP42463163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c3d321e7ca97b5101d3bc320e1186ca2d2e25bec7f6a0e34b7de8e23f7f659c. 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/QZZ7R2426395.