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 0xb00c6c31fbc1d303aae156f0a137da0fb170d5fd2795e150ece12932344b3313. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/88cfb6ce-f9af-42ba-8c1b-ab4cb8a0684c.json and https://artists.proofprofile.net/proofs/artist/88cfb6ce-f9af-42ba-8c1b-ab4cb8a0684c.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 0x3506603f19fe52ab08502e17cb03978a299a86480615c8f88024027b64dee464. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/PLA142413101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x089bdd1c58d47f89aba2c49d0c4ab3628356bca1025c12a8f6400580c2d8625d. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/PLA142413102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba3b2f1bab2a7cfca6ae918dc00e19de86ba0198994a47bc413ff62db82bf446. 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/PLA142413103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x213502d6c9c20b8f52fe2ba154d11adfaa83f4aeee068e4b7674177edec38a44. 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/PLA142413104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1cd906864126eba15600858d968e1f2611f7793cba63ebee49cd885b1eb514c. 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/PLA142413105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeea7684beac6bd4f27dc0e300e0b2a8540905f2b87b453e84b7ad448eb10b16d. 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/PLA142413106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafa9a4785002993fb9bc6f1fac3dfd386ad75d0651d16673501386b430f48b54. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/PLA142413107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85934157fb15bc53f3e477055011a2e55535f4ae69008c6ac599cc2f5f84257c. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/PLA142413108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x945490e34813e26cb831960a1def791ea341f08654db2d3987370743f73e39f3. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/PLA142413109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bb03153ef8b5177dafbcb883f50e39495b5b6248e0a3e6f9330847ab44f183e. 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/PLA142413110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44861e8043ec90a9749ed210381c8b39f458198b555a8304be7236ff68fec3aa. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/PLA142413111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48f1ffb8f8a9d338ef1c198bab15d39ffe0ff21e24c77a61db03b6bc5ea129de. 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/PLA142413112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15de6d30bffea739d81ba77d7925b8067b12170d36ce1a9ef7c204968f4ea020. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/PLA142413113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf83070d5487a21a2e1ea680e708d1e7f28e3893b8764c84259f27f07c0b17797. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/PLA142413114.