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 0x0c2b9b7d73c146c1ee28aa781e360da2252ee6d96d922e722a1a1761bd5d5f7f. 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/d8169bae-4aa6-45c7-bcb4-e75f776c6edb.json and https://artists.proofprofile.net/proofs/artist/d8169bae-4aa6-45c7-bcb4-e75f776c6edb.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 0xe7679fc28f8d62d95d31f942ccc6b88c556de4759068b8e24064ff7cc3cdf8ee. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T02:42:38Z), 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/QZNWW2327395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b65fea6e8d836f23543e0bdc5773fc3fefdbe4a0f34dbf4e45334746b55b1ee. 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/QZNWW2327398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeddd92a08b1b38d9fb8f8f3c67c1fb848e98056e222c9fb13d8046f48b1fda8f. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZWFK2333767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x323df43a73b9a2a03de16e5b12e44675b1a8cb5505580f4fcf4ade31f51a889a. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QZWFP2328427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37e66b4cb6dc2c0273fecd5094a0ea2da153015be92dc0363f7f64df1a05b59b. 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/QZFYY2415663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4213b856dd53d06d075eabb5d185f4345da911c595b5dda13c343d73fa1ff7df. 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/QZFYY2415664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x209c35cbd6066c0b6d41a1f3bf378fd7c793bb3cb6fced1421ec91027462340a. 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/QZFYY2415668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf71b3079cb59b25f7177ac7a09c349cb184094dfd3a060fffdbafa98e13f0507. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T12:43:17Z), 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/QZFYY2415669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58788ec09432962ed5040a97c0ce6585c511523c8fcd25f4ea6effb9f7d29ac9. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZFYY2415672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7b2359aadf5fb5c5aa9b5d3e91124ff0d8473e5168cf5c0a860afc5169318cc. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/QZDA82496252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7970499d616a6e347b203f72ef0e0e419522f5e8cf383888c6f3b9fa67fe818. 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/QZQAY2488243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x278ed4265704aee663c58ae93748bfd29ebfac19d68517663938f0ab17192018. 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/QZTLA2446227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63f86ff99e460b62dafd9ea0d6a5f7d7eb436bbab4be2ac01f67879506955743. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZSYP2478561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54ac896ea6ae419d922188975ae8c09ba9f94fe6f999e9b45819d0286993ccf2. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZS7J2412101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe40ab47499c4d52e8199512728e3f2a9bd2eccb47ab75b7dd3bc8c922b4fbf90. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZSYP2421380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd691d2370bcde69eaf3f142066cd46b3cfb6aada0a63090ce6944b9c02a3d70e. 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/QZTLA2543637.