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 0xd6efe7f1586728e47b77d126e8fe2666000e8acd30d321f784a51b509a885fef. 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/031aa60f-0e50-4959-b56f-1cb4eb94e7ce.json and https://artists.proofprofile.net/proofs/artist/031aa60f-0e50-4959-b56f-1cb4eb94e7ce.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 0x1263b150d1adcb9e98f1ad9399f9c8518d2dccceafbf9e523cc425371a7f67af. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/NZPB12302953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2625baf3a671505840cd6870be9a4c3a3a9a3fe4bee8bd3af6d07b0628148173. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/UST8K1602177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x557ca951651f540176ef258d3d91b0ec4bf9c5399da1a681e0b88c3b16632e03. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/UST8K1602180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cd6e78a773b42cfc5213537e636b197121cffa5c40a020ec99bae5cb7a95944. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/UST8K1602181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f4f177239c38aef7243307beeaed9167e3b65a06d3423a8a7e5ab637578daa. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/HTTPS7738390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a349ef1289d2c9de93eded6e0ba6fa5d6051ad99896d13a6b9688d567f5d798. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZ4JJ1810444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd995f798962a452a1fa16381bf0ca828c3d0949be8c2c3a67583efdc236f4aee. 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/QZFYW1901306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc566554c81a3f5ac1f53aefed4b71c86bf11cb358ccd220656f0dbb682133ae5. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/QZFYW1901308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x444bb21978f46fe19cf66dcf04300af33cfbf6177ae296ceec373a8d857ec77d. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZTB52246268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cb0b26037db935deffb7d8658ab3f8fb2faabba487874e3ffe23d84c5aa393c. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/NZPB12400503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48ff117e7ad4ddac6a1326e60a03ed53eded5b480fbd884207f437468908b5f5. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/NZPB12402923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d482958d4b6f51cbe4743f4cb2fac2f6f70063f9b60bd2810d7978b334b8a1d. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZMZ92584886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46c65b83ac099ef4ddbd2bcf49ea52d683b3a7f1a50ec23bb747fdfdd664cf1c. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZMZ92593173.