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 0x8fed09797f9e3e290abdcd1a725e1e1032ea8075b18c39f4c98576a977bd4306. 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/4f1681e4-7df9-40a8-880a-1d7ac7ea945c.json and https://artists.proofprofile.net/proofs/artist/4f1681e4-7df9-40a8-880a-1d7ac7ea945c.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 0x49f0e75302124cd9dbfacdb3d91fd67e583380a33de1dfd4ef00bac85d3afdd8. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/BXCND2100280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8f7640a43ab8a9593b85c0cac7a9fc659c7dc754c081d39d97e7b2cea3516a7. 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/BXCND2100286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42d827fdba5fd8960bcd796c18a723687350a79fe3167f548686d1fa1740f6e9. 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/BXCND2100295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c0c967762f22f9068d0b317d8102b71dbcc80e0928549da165dffa863adf78b. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/BXCND2100335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x940edf9e66a4cb608ae27ce60fc6ccb6b66b789c3edbe4593df67ef059637399. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T07:21:40Z), 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/BXCND2100336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcadeecb9bdbb687dc9cbd80ca7893227b761f8980c5efb1fd348dc36dff62c31. 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/BXCND2102108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9378595f73f31370afc0ee3f5ee1f37e65a5169f03e58e77dba20349a7ab0087. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/BXCND2102109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x583916881a26cce778a13ccde105b2e11163f601f6d3a6d32244e02e29f45248. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/BXCND2102114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8775a429a3aee89342bc0ab4a4c2108863a27b21a54647cecc2b7f2e5b6bbab1. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/BXCND2102118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45d384fb14ea1a3ba6fd16d9d88195362dc82d34ea524820f46343a4433ed316. 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/BXCND2102120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6e44a32435605a5b92248c8dd503b61be61d51b9c168e92263f8202b2314e73. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/BXCND2102122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0367e44435050a05b1c6a02d4d9fa9f156aa014a3ee86c0027761dd55a9ba6e2. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/BXCND2102125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1f3d27f0360d092ae9159d96748d1391a367aa9129ee9fe4af4961403b0b04a. 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/BXCND2102163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53531414d9c6f49e5cc26d65c5a7642e09af288ac0f83df307f6dc86d7281f25. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/BXCND2102165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x417df0c4b3700785b67652e3f94051b52e39e8263784da28b023178270455ff6. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/BXCND2102169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aacd20fbe0d7a2dfff55345c05f081b0731c61423446887961215ba2f62bb4f. 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/BXCND2102172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeecc78635d18ce5bb4369f8bb76f8a746e28ab23fc7770f1a44746d8a8d9cd22. 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/BXCND2102173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5c28b22d9498c52b803a5eee7d2665cefe59df1dc7fc50d010acac6950ca971. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/BXCND2102174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1863162a6b6d1f6a28f9f8898ed429f4e5c19706c316ef94486dbc8be22e300a. 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/BXCND2301323.