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 0x81f3825f9255712850b62d78e8f68a123e80880af7f837da5d62d582ae68dbda. 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/fde5ff9f-ea6c-4e0a-bde3-197855fb6dcb.json and https://artists.proofprofile.net/proofs/artist/fde5ff9f-ea6c-4e0a-bde3-197855fb6dcb.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 0x95aac847b9d927faa66c22c8040f676ffafd29688ed92a8a114a64bf254aca35. 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/QZTAU2454074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b24aa719b855f09c214ea9ec91ff80a8ce81b8c528b2c66a764eed0b966440e. 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/QZTAU2454070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x707345b4fd7b2ebb260be48b154f5b68ad0c29c84e022ca85a05386d357a1e7b. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/USANG2289908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c4e47db6ed5b6fdf196cce406981409f7d668578cdf23404d0a80fe203cc855. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMANG2233739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70da90dc202d0d00f3a5a7b84f67ee52472e62424c42f64e8f5dfa66aeeceaec. 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/USANG2498200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddc05a663845c910dea991eefaece87d4f09c12bccbc3d6b47a005a60ccf277d. 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/USANG2498194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb10225587ddea6b34b617347290b12af520e5b815ba3c7acd4b62a196e302545. 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/USANG2465178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3963415267a308016d8a8961f856532e3bcf029d6c02d123d960f79c46bdfa39. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USANG2438512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4081bed364ba17a3b45354efbdce3b50ef1d1513c1671da05de6fb33137d14c2. 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/USANG2436891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b8be8920f74b789a28c1e62e5ff0165af4e5b539f3d9170a248cef5093e5840. 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/USANG2432424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e4c86697d6b8f28b10537cafe1c879c27e4dc69d86563a4077329cb5e349e79. 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/USANG2432185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba5d44f62ab195fcf773482e8b5410cd751bc3b8c558da650222dc2831996f81. 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/US3DF2498729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7db282e8a38ddd9d54eb1756eb435fe6ee069ca27db7f4d70f4147270a0a02ad. 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/US3DF2470465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x248ce55717203a8cb629094ac634f1d836eb821ea99361eeb03badb9dedad060. 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/US3DF2422400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf44ff7ce1278aee29ca47f9704258eb5c09d5bef7ebc79564f9de646175d35b1. 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/US3DF2412643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e2913e2e40741f940ec23c74aca19f482eb1b785d86036bdc94c5ba2436fd6f. 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/US3DF2403995.