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 0xf2b5686c2fdfdf126e4874366b05ee2886c500d799eed0651de182baafa3ef92. 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/51de0c23-d8ce-4dd5-ac78-c383c40e54d9.json and https://artists.proofprofile.net/proofs/artist/51de0c23-d8ce-4dd5-ac78-c383c40e54d9.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 0x8adeca532424b3d972880580a780878d2ac582440ed7d3b9b662466f707db9a6. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZMZ92415808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58d111a4a15d506e4002cabd1b841d2b28ec193f2ad3e8764664b22fcf04f030. 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/QZNJX2410026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67f9550d5022b338496e492e68f427caf96081747ef69edb0dba3c5e82b7d8aa. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZNJX2459705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x978de6e1f2bf51a9d48bcc00f547c908ef80a6835e8b6d25f2bc106fd61afe25. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QM7282414761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fed20b91af8ce90b6a92c4af0d0ec7b48520f8e9fcc167ba82849fc4c69102f. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/QM7282474974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70d9c13be186c894fa02d4ba2c088368351a81d0a02ce1d4c760552dc0fd541f. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/QZW9L2492002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ca7b522cd65e6aabab5b260c6ecc4e9cddb93c694b9223494886d5a06734892. Chain 2 (Bitcoin): anchored in block 958051 (2026-07-14T19:14:42Z), 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/QMFMF2441017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5839e8d32eccdbdd493cfc198eba52ee127e62dcc11e5e724c09f845d4c1dc10. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZMZ92586850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58d603f6af8aae98203bb1e4e1739ae82516b7fa01642b08aa819ceff34f2236. 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/QZNJX2512647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bbd98aea0a0df2b8169c93449dbe149bf506d1bc186fe5472ecdf515d72821c. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QZNJX2516015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd136ec270b8e69e3cc99d8291108d7292f967250d7ae98c2c46e96b4ef54a0df. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZNJX2512648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4760b52ac027ad0fbf0df0d4b73f379f22a902c5828fb18efe7c4380bcf6c9a3. 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/QZNJX2554679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51451a12d807b7c0f1a4400f7a38e592a0cdb3c2889221b44ad0db7a6ecef4b5. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZTPX2524728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb394feb1dd1ba5d7eec6dc94017e810908180a24a86a8ea4f94782bae28c68c6. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZTPX2519952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f24b5029e455032f19c22f6a461becd1144d9b1f274d6e136172f9e59e01487. 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/QZW9K2380037.