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 0x35eae56abd8562f2c0d4af558b931aa1731b954f284f3ac569f6a52f6ba3b8f4. 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/90b1a77d-eaf0-4329-a2bf-0716d99cb5c9.json and https://artists.proofprofile.net/proofs/artist/90b1a77d-eaf0-4329-a2bf-0716d99cb5c9.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 0x33649139be158fec332418f42276523656879f9bd0c3336b676904df1cc59c68. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USPWN1200520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd706c127fbce09f07234a4b8eeb63da74ce55e086e7d505384e50025ca3a2d4c. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/USPWN1300129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1aa775a477a560d3008d50cb36d12311a58f255c04dd98bbf235a8d0fe6a5cb. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QM6DC1528010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00685ec0811eb9d807bfa8db4cffdbf657bf5bfc84b5ae00ed6003705bec3470. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/SE6XY2541466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88ca7e6b65d15db0d78a225dfe4aa0e0f5ec9c63253e5b8887e114e27d5318a6. 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/SE6XY2541468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20dc056b9774c6e9055d94628d7a52daec9aa3f8bb3a07e8c598085706128f77. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/SE6XY2541472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x452f5893b6e3231dcee8d9d088c5378204cc4ed9d81a0c4e63bb408f8b173f31. 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/SE6XY2541473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e9e6598830a94f4e26b85f499a09526d2c369cbc4c900b82cec2c5b0a3e1bbc. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T07:21:40Z), 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/SE6XY2541474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46bde74c5303da1f448be8ce318eb60a61c8a048223f5be7b3263f7ba46876f8. 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/SE6XY2541475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31fc867ed259859ebf9c8a427d827ba8d95c364e71b94a1ac8599543f8feb16a. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/SE6XY2541476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbc002605a748b084af78d051c1018cbf41775acdd73da71831fa6553e1fe288. 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/SE6XY2541478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07b8b4c92e01b4fa0ed992f694669e8dad1ba505248b9191acbf1d58e3b4fffe. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/SE6XY2541479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8482e0504066b86a642625cf0fdfc4fca52e2be5110e67d4d4fe46af21494f46. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/SE6XY2541480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d412729b8e20a39ef2e73dec46131f83301297533da5a5e6f4e47a644e28f83. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/USPWN0810562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfad6e42045cdbf1344fe7253f2ef869f53884491733e7e67046511e2ca557d17. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/USPWN1300211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bf26a922b1af200ea5a06560f5c594eed366f1d538c5417eb54144b9b2d8dc4. 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/USPWN1300216.