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 0xc4fa4986bd26f921ca7297d7a21cd9fc6dadfdd1bc3a6ec6e46b2262a9ce7fb3. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b2e0edae-89d4-4ec6-bd6b-7697c0bcd835.json and https://artists.proofprofile.net/proofs/artist/b2e0edae-89d4-4ec6-bd6b-7697c0bcd835.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 0x2b2c67ab01458577e62922d2b5a3a721a39dcc9b1882b198a68bbc2bfb84d145. 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/SEXHQ9200401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x714c91193759ca9d4132be05d523b1d2d33fc3e3868c05bb9836feaa59c3dfda. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/SEXHQ9200402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x498941cbc1922a814df6357f56b2712c8c5abc1dd29c9be70a33fd225200211c. Chain 2 (Bitcoin): anchored in block 959063 (2026-07-21T21:45:32Z), 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/SEXHQ9300501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x102eee9a0af2df22b43f3697722bb4691dd5b45d03e8369ee6f321257a9ed844. 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/SEXHQ9300503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e95caf66c1d9ee3c7981605354c74ab8aa5a127288d9a55306706f6443489f5. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/SEXHQ9300504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85bde8a54be0a8b1950c0afd7911fb99b2f01ea3c81bd584fb965c5af19eac87. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/SEXHQ9300506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fe30683bcbc972a012cf2c71600474c26850fdb82dcbbc12aeee4a8b97a1320. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/SEXHQ9401201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3f4dcb05327bb536285c625d8560e6803a1616c825375d944b4180c40212273. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/SEXHQ9401202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a5099609bf3093ba63a13aed2de918e489dc759adcaeb99f4c59c981e8e5a8a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/SEXHQ9401209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf84a8b253a0d36203e9b36529411e876b77e9102b4786ba8d1155105fb61d2ad. 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/SEXHQ9600301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70a4e64afb466faec1b5067c61c9bb970ec8d7d0424133747a9345790850bbb0. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/SEXHQ9600302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaa8acfa013179260fd9039e4404f69959ce24e9cd1a0c458ec9a5fe7fa44607. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/SEXHQ9600303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8d62dd9c17f76621fe2f0e2f83c412c741f60a948d11e80adc5c371453a0452. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/SEXHQ9600304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4591d66244d41cddfc2d9b71617c1cf8b0a447b713d8f6c205a735d0f6cd99f. 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/SEXHQ9200407.