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 0x9d2a2ababb8f63e8958329d287b643a981fb5c29596962461070e0665e51c7d5. 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/b5805009-76dc-4c12-b51a-6e12781ab00a.json and https://artists.proofprofile.net/proofs/artist/b5805009-76dc-4c12-b51a-6e12781ab00a.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 0x7d2fda7d24b1634d6cfd42aa95bd168df0db277758717074eb3c60e56cf3f88c. 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/GB8KE2306975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28aef822277267cdfbf02eca92773623c348229f2932492062bfa41a710b48f0. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/GB8KE2313066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc85b81d7b632a1ebf3adf847ed1ad759c866506b5264a1f698dd4c75d789968. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/GB8KE2314174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x786de66bfd7f85d9ec6fc0a8b9542f0546abf46e52268dca009d9e2726ae4388. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/GB8KE2320185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3465455b0681bf325f64d6f2f3d157dd4c8c4d3c94f1097540f465ead01b6373. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/GBLV62306408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfd11a57db456e57533756380589e9d8305a8ffa703f88aaad4792576fa320d7. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/GB8KE2403066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7e4b25454efba5f00ae86ffdbc6b77130172261a096de8e1ac3f0160e2edd02. 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/USANG2472434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa799c374728c28b1319afaa12601293ff01b081ed1f55c0bd6909f85daa416ec. 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/GBLV62421107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa63d9d9e3b8160eee616f1d707ca06e725266f53d4d6cf8d763013a60bfa372. 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/QZPEW2526739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x076f6ab932273f4554b8479c87b6bc7ca8aed014bca1ebd2206da072b4b4cdd3. 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/QZPEW2526741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab49e42708a75e47f9d0a8d218a4f22f5aba1078209da079ab88355c3e50a75a. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/US3DF2507921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64cb0701bcc688e90e2a183bc8ed90cd07a0c968654469cde1f5d28f169d36b1. 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/QM4TW2563643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf82c7efaff993929ed7528c64733db818b7615b107e166a997bcba22293f974a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GXD7V2543588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c26a79b579cfadab9df357e5336db385e1dba66ecb91d543bae1a6ca862037e. 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/GXD7V2572020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64f5fac974adb1adfa99471f99f8bc3cedc88c54ae7bb7adc0e9e6d93449ad97. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GXD7V2598181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd436c7e8453fb3a3006c2d66081315401c9de961f2b420baa9c8a3578293fdfc. 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/GXD7V2567204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x513642aa093a9eb7cb8ccf318cbabc9f844239f302848e6a45cda094f3f5de98. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GXD7V2575703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54c3832aa679eaa91482f36dd6c4c9f7c2a9dcbc47b2c78262443a8d6d9ceb5c. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/USUYG1734435.