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 0x260c73a38eec500743b09fc7d7b77c2dabf17ac838d7ebc702c76847d089a002. 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/621a86d4-cbd4-48fa-a395-5af4c27f778e.json and https://artists.proofprofile.net/proofs/artist/621a86d4-cbd4-48fa-a395-5af4c27f778e.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 0x16dde32a10aca76ce67250e27c04f57bf9c090db67ef1000315f5e8caa60021e. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/PL04N2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f8232d61eb872fa8f3e632b2112fa603a1d4bf0bf944a6c328636115eac4a9b. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/PL04N2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcff200aa5e08b682889c4cd0722d67b38b2290386c11e7f906c77cb1a8c8a597. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/PL04N2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5532db1c7d00aa3441d2efe9fe712ac5b97610174c657483e4b22c8297152f12. 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/PLA552100594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f4d06b6a21794211e1ed5b75dda7dacdc7ac46d4a436487304aa015d09f3e73. 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/PLA552200088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5849f5068380eae11fd81422ddae95c230d68232610f28fbc1bed6a39e5e8c8d. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/PLA552200213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddb9c20dcc9fd9e9ad3df9f1f1ed4f56b4c7a129a9f725df546189b48e38d786. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/PLA552200251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x895f1e4ccbccc030125d3a8c5f1a1c6df823bc4159ef115dc3cdc5ddaa1f0b64. 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/PLA552200362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5532db1c7d00aa3441d2efe9fe712ac5b97610174c657483e4b22c8297152f12. 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/PLA552100594.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71a67552bfaeef37c4a5ef2d8116cdb7082da6cc587e178eb8d73224db6b6cd2. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/PLA552300350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05876aaca2b3539ac336713e70353b1cda7aec8b15a2bd4fffa4a0eb5862ae53. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/PLA552400015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2842e7e73d84a69eb5696bf01a7ba7f7d84e1bea66e35d38f95dcae450c7f44a. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/PLA552400016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaf56abf8c77db7d1bca20bebc265e0763aad28af4be8655e8c684d64afd24a3. 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/PLA552400017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x992f9cc7e48d748bccd752744b6ac8671876a4e17f1818e928d275669e071f38. 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/PLA552400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeb938973ba256c52693d51ef5f9ed7a5317bfa5d2b4ebbeb01ec08139974f17. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/PLA552400013.