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 0x7533a13b0e2384e0c2ff187fbbf55f357327b89c4e7ce64ca002aa53af20501d. Chain 2 (Bitcoin): anchored in block 953616 (2026-06-14T08:58:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1b01eef5-62fc-4a18-9a70-8f3bee742c01.json and https://artists.proofprofile.net/proofs/artist/1b01eef5-62fc-4a18-9a70-8f3bee742c01.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 0x41066efb193147da6e3973924d4f73f0746234bebbb18e01bf2001bc57d4e568. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZWFR2578898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc84bd55156cd4643a30acf8b4eea780f69d2444551892820c55e024ead0b7ade. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZWFR2578877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f2921c1f9531727d0edd877c4c093e1d884e47338f21a19b4b7acccce5db09c. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZWFR2578865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x455f39a427a14b93e7d89311f03f59811ec17f5f4d1d6c96ab2f2d43d965777a. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QZWFR2578864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5b5278bc2cc05d641146943d8a417b5a8f0d1aa1f5093714a40d476a61a6aed. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZWFR2578885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a51c207f548f94f2e7126b226c8303ea7af8032b423452a207ad9ab2d78a4b6. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZWFR2581379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb05f70981bfa6bc4bba0073b6d50aff267d05b86426bad8dc06df9f5f054324d. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZWFR2578868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ef88b200f0bd41f33f25cd8d8c8ce4e5f3fee102dac4d017960bb7d4382f0b8. 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/QZWFS2586660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bcf729f3e648ebfaa15b00fefd5cefc8f318286228daa5878451908b2939330. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZWFT2569544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa78e60e9a2f104c8c4c79617da40d535e7aaeb2eadb0915ec514068d9ee4e56. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZWFT2575511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fbd775b710079daae55f6a287bd77f7348e2a73d6013e30de868379ae5c5758. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZWFT2573409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40ac5f346714047b3ae099a3b71dab93f4dd8b67d41127d8a27e24eebae976dd. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZWFT2541129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dc39669b7662f476bbd0c23f28d274661147487a8587a76bd115cb5c2f40bf3. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZWFT2541180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd57b559d429796bd6db3ec453a3a67d4c168d63d652493422cb0ec89d2a7e0d8. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZWFT2575505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe746eb5b6600be7be9c68b0e35d8ee8f20156dd70418b4c491a1b5cd65ec3df9. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/QZWFX2532978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x875b255dd022d7035ba0081d3f1b2e1748027b8a19c1ec098ba7a64437290f88. 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/QZWFX2534975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c1c67f0543b48d28ac369b51347e2d91bd272107cb1d192fcadbb71fa11a235. 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/QZWFX2532981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19a0748479dc1493f161327cc35888a03862afb319e2e6e96658a999de22a996. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZWFX2530750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d57b859a40dc048ebcab9b2262a4fd0a12e4a5ec9468640940576425e77a604. 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/QZWFX2532988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeafdfa7f57cb8ec607e9edeb0e5ba404d41a9648849f673690494a6738b96c7b. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/QT6E82581832.