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 0x217c5eb39049aec646d7b88a8fca2d8e09f91602c441b460526f5ffa3344754a. 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/eba6ba2a-b0c7-48b4-8a6b-0755bfacb4f7.json and https://artists.proofprofile.net/proofs/artist/eba6ba2a-b0c7-48b4-8a6b-0755bfacb4f7.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 0xd2602bbd6be4e6b66ddca5bc14f878e0c6644f0799d6e4b76e866d14717dfecf. 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/US7VG1759468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66aaad84a77edd2ae2ef4ae79c7d323d52dd8472881c58581dc31c3354bbd143. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/US7VG1759470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22cb423d36ccf98bcf46790f507da37fb62b38c576c0b0b927dc1c8fd2c754bd. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/FR96X1809357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdee32db7fc0b545af2a49c3c030d8a6aa8646cfe1cf84c9f1077b8aaf716c650. 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/FR2X41885815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53b0302af67e0ae2d6d0bfb0ef1aa700a3403c48931d03b37d18d83093b273a7. Chain 2 (Bitcoin): anchored in block 958130 (2026-07-15T08:37:45Z), 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/FR2X41885817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13488dfec4331621884e707a7775ae9f291eeb6c874ad17feac9b58983f65e5c. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR2X41885818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb36ed7df53a301b14432e3b1e90d586e9a1e91036757188e07f538fa0a26735b. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/FR10S1960049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ae96f6a3cbbd820e491cfb9990f4ad5147058e85330d6516902d6287b8e0781. 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/FR2X41971559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b675006e043e1ea7fd3b2a83c7987bcd77cc48a0cfb2819de1f0c7eb907a867. 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/MXB232400067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19415eccc8aee4022ed9902f0f94d33944228d1070010b3a3ff2b5382cde45c3. 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/MXB232500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8da86d66ddd46988afe2b89a407c9d8049244036838a92e69c02e496a2496168. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/MXB232500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4260c26b7f5e3c6039e559d5581b38b3d9a2a60eb109245d21b9c15de0898cfd. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/MXB232300074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf10b65fee9dc15e541e6df9369e1d22b241008b16f9f51a17a9cd1891c64cfd6. 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/ES5022100887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27447008b1efa1e6271939235e37f17e0a7a23f2730f7a58ac1635a46b106937. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZGLS1927072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf10b65fee9dc15e541e6df9369e1d22b241008b16f9f51a17a9cd1891c64cfd6. 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/ES5022100887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x867bb8571163318b2a9cde91075aac2e2ee0715014ee6573b2d1f67ac3ac78f3. 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/ZZOPM2105523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69c75c12f15267e82fab8f5e18c8db7701a230c5eeb902c11ffa8df0ae582c70. 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/MXF152200317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b8f14c5a626902f60634ed95281f22ff8bf9630f93f8d0e25134f5e9c77c69a. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZW9K2270131.