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 0x890e1b2907037c012140dff30710a8decac5c7b871247f80f45544d04d6d0dc9. 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/86dac688-a77b-4bab-b78d-ad18ecbdb3ee.json and https://artists.proofprofile.net/proofs/artist/86dac688-a77b-4bab-b78d-ad18ecbdb3ee.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 0x20d0f598be10a2441e903578da336eefa9fee8bd971c5d23370eb431f474aeea. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/USCGJ1992726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9e662088da2e32efd88d7b210d3b50784b37ab5c900aa451cafb32431d035c0. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USCGJ1992738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dba0f242f0b5c57625c4019d51e5c5ccd08b5acf48ba873631af8fd866ec592. 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/USHM81974621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe60b959c95fb2a6c2161832ac8c6c183da4789363ed847466c06bc0918278782. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QMGR32073547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01075a76a6e36ea9b5faef8d9ced5123a8029165648d51cde41a9fd1af79338a. 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/QZTL92134848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66e55f4a7846790ebbecf418dd738e224e0ead47dd120e3764bd5354cfceef62. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZS7J2290023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58c968cb8b2f748ba6630c634c251300e1f9ede9015a30c80c9ed0f8b3a98906. 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/QZS7J2251132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc69ca1bd7b547a63188cb5dfe648a3271e5ade1b3a57888ceef850d1dbdfe21d. 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/QZS7J2235225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x915a91b962643e57890244e5b70948bb7f629aaaaa835de8004ee1161b837cac. 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/QZS7J2265897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9574bd91e34a93ebd3a57e7d050391632128b36012b6ffb313d7311595287824. Chain 2 (Bitcoin): anchored in block 958963 (2026-07-21T04:02:02Z), 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/QZS7J2283487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfbbf386c6c7e308d7c886adaebadb23790294135720d73eca7880686475d811. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZS7J2291743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f69cf1b73ab1025dd405893f1a740bd5ea5de45abb832ac48740ce28b227d81. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZS7J2296756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafce651f0815cde265e351c25073003b460423f6c997e083a55114e3b794e146. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/US7VG2316456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x324142ed9ecbcd0e6b9fa036a9302244a6b89b733bf3bee4e81df9552982d3a5. 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/QZGLS2337018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x246f6a9ea5d3514a9cab84991fa747a62c76290257221bd4f7cb930b2abafae5. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZNJZ2385001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4388eefd1699a995115ce21f9479146000712821ccea36e2a67f7241112caf60. 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/QZQAY2455768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc131ee3e2d5d870fc6acabd046a5c1fd7a68fc90a9406dc8580100d94e6de50. 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/QZTLA2218502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09c78ed34c476dd1990db56fe3a5a004d708fa057a1d42015eb7a2dda8fae33d. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZNJZ2177057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37dc4d821516d133a662301ddb60e5bc030f7ac3efae2f8c3a54defcacff7571. 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/QZNJZ2177067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eca51e33c5f14e42aa59a4a58b508931467f704c64f955427c615e3775de675. Chain 2 (Bitcoin): anchored in block 960223 (2026-07-30T07:51:46Z), 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/QMGR32071379.