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 0x1604a62f292ca62640c53449fd167c42ffe0ba7cd0959c6d5f7d1d9b959113ee. 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/fd7de267-0877-4808-b58c-b10732e92d32.json and https://artists.proofprofile.net/proofs/artist/fd7de267-0877-4808-b58c-b10732e92d32.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 0x97e81482d4343b3fd963aa13300b4abcc7f0e5a019186d410dfc6b257066f18e. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZJRC2220731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e7f166fde63582b936c3179bfa5d1defbb721061c9f74c3750ff17b25449786. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QZJRC2220730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd327a47a71c11049ebe5bc6b21452e6b2ea8153766ff54a67065f2ca8985a9c2. 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/QZJRC2220728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56ded4dd8948cf458383eb8ddd803b95264e798eefe0f2749763db31077cb61a. 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/QZJRC2220729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad4f6f5524e8b11362b2538b895daf787494c68d9352180a88fed9e934f5ab72. 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/QZJRC2220727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfd7a495545cd6f6d2c4df4835204d81252bc5b9be99ab8d7315d6b2686e7be9. 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/QZJRC2227322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbc09da679437bc560d39d34ab68c21968e7e540e4fc79964f6f7bd5c19572cd. 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/QZJRC2250438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99c62001d44858ee34f7d1ccf7e10bcf3e50998608d65803e583734b261cde72. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/QZMHP2328670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59470bc8c6e9aafeb5dc8ee476cd3e1a0832cdfa4cbe7af9b983c5dd0a0cc949. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZMHK2313334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x996f6f962813b5fdbb7324eafeb26aedb4be32290a12e1825ec44cbe72fec2c1. 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/QZMHM2354391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ac9f2ccbdde05f866822ba2d8d1d23bb55ca25ecd3dd872cefcffa020978228. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZS642348206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eb024e73894ef9dddb6598eeb444dd707eb32660c3ced83df90645e3d7ed5b2. Chain 2 (Bitcoin): anchored in block 958573 (2026-07-18T15:49:54Z), 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/QZMHM2385458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7780169f626317e5d557fab4c7fd5e842990d8e97ddeab9c1266153810c30acc. 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/QZWFG2382843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a91801978ffda77686cbee24b46c94ce0b99b25085f183e0ccc604f712e0b62. 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/QZK6J2401437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x231904ac049452471c1ad0004fa53a86d823887d9197a082570f62e5c6cec51c. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZTAX2361240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ed5857cebe072d9d9596c8708fa113dd78a4d8fb905114e3076708d394b21ff. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/SE6HN2403762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47c436ac990a01ac6308e0ecaa1699fe8e29fe0ed2456e1ccd2f8b4b66ebff12. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZHN62473313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6da59d42e659f3bd783af21ef5c86bb7de59434699d4fce980e0553a53b9181. 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/QM42K2261301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a7317db5ad0b66e932526c3de4eddc3b98d4b5d5242ab32509929e5e4807b67. 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/QZDA72330979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ba94acb52c67748c07a75d1736630a617231ede31396a076c99200f5cf615a2. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/SE6XX2503963.