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 0xab8c06ecdeb485b568c710d0043023b28bd51b0d3c5e47e5baf86f3d15a1ac24. Chain 2 (Bitcoin): anchored in block 954623 (2026-06-20T23:40:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cba963a2-7c5d-48b1-9377-aa5f97da2291.json and https://artists.proofprofile.net/proofs/artist/cba963a2-7c5d-48b1-9377-aa5f97da2291.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 0x09731f4b656ac3d4d195dc4b3f92df9e6ef8e06d3b4c0d9a21c6ae0393ae45c7. 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/QZWDW2533819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x442881421b5d523af83a2497103dac147d6b8b7c4b76ad1b5589653bc21010ff. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/TCAJU2515187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde511ca037711e9b73545b3d00032c94f5c765940108944e6904095a1c7242c3. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/TCAJU2515237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaf702edf105d4960f888e18deb9594f8d3cab857a306db3cdfa6639db654108. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCAJU2515273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa03d58ccd51ae8e7fb052ba8533182ad5810316f5a9d273c3c10696ab79c2804. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/TCAJU2515318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa477b732dcb8ee8546417d796a333774d37d1e3e925f0cce518040967d7ed5d2. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/TCAJU2515333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x593cc282ee52b8932d9bc9dadfc6d107faf162e0eb4154e58c51862830f4d223. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/TCAJU2515385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefee7fb20a41b98daf0e691dc1b16fc91d1a530b8a9ed181b9f00f2beac97dfe. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCAJV2515406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8912528469303f0e9131f8bbd1d479bd6d49c2c26cd1399f523e7f63acffa888. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCAJU2515428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa65816497f1a5777ef3b58686daf5f8228b05521faf7e35ebd685aa3dea270e. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/TCAJU2515451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x421f5b0b2f9178862dbf94f9ba2af056f3318bf1946647e9cd50396e83164b8e. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCAJU2515475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef0e5f3511e2815d6300ed36d4093ce25dc43192be6b8dea4002f20e89b0466a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCAJU2515506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0492f16017a7f9bc5156ca44671a921c4d9a63e7fb8bca3af3c20d093687ca1. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/TCAJZ2546704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd2b45c66137de0dd71d4489ade99d932b8a0186923495c2ec0cff7f85026d40. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/TCAJZ2546745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf089024ba6f1416cc3acd2fae2474979579510bec4331fd524b76b6f3b81f25e. 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/TCAJZ2546807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec15341ff95818f604941b50088f91a314a2e108c4a865cf57baa3e62fa48a7f. 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/TCAJZ2550432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91c8ad4f88075c14747ad367fb243c7f168bced0b07169777a73517fd0ded561. Chain 2 (Bitcoin): anchored in block 958882 (2026-07-20T12:45:27Z), 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/TCAJZ2550477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x519aa7c441b0edde347d9fe79a1e8d73ad41adaf3028be35a6930531bed25ee9. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/TCAJZ2550517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd95c8ff0166fb87019137ccb1f53f798f4e3dbeca653434476f475fa1b9bfeaa. 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/TCAJU2589094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd1236d5eadc30666a3ac525036e537cce949f261913734a27acc616a9473d18. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QT65Z2565795.