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 0xce9915dcb91150097355ca8589c429ad8a6f358383b1d993f52c3e9020d04217. 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/7b8c2823-008e-45ca-bfa4-580180298455.json and https://artists.proofprofile.net/proofs/artist/7b8c2823-008e-45ca-bfa4-580180298455.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 0xb7bf73a7a789547e7aeb92dbe3157b3108310cc6eb4a45dd6c88068da2b620ce. 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/FIWJZ2000049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f4d1880b910ac9553217338d59f91328c345e160fd2f163dad1aff529c6c41b. 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/FIWJZ2000050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b9d1e46fd1ba2a0ee61d098552d3a3bc02d4bfab9eef60c8851fcb9603ea4e9. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FIWJZ2000051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98109e93267aa3449cfb0313a5eb579ea9bb2633b679765553b38e2a781b7d3b. 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/FIWJZ2000052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2411345528d67a2691f488d9b5a8600519c7c5407557c5f0677c710b19a600b. 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/FIWJZ2000053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x328b3070bcbe60d92587b657b24670f5e64f077cdf0001fc7aae0bc39c5425f8. 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/FIWJZ2000054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x321e720b0fdea6ea8312a2e08d58a2b69fe0eff2991950f7894e56df7d26be36. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/FIWJZ2000055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76b402b0c27ab0ef7e343f87c883b60a9b6901953dde978527039d6e3066baae. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/FIWJZ2000056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e2f4ed6d789a4e8782cceaa0c7e8521b641d18555345e1db7af737af0f6b7d2. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/FIWJZ2000057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c1a1dcd3f9c3fb057a2239506ae5c99708bfe593192939e3e2fd54381ad75ab. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/FIWJZ2000058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc32c75a6fd92b685bf3b8f009dba6f59f4e627b135b188d0206b4f00211bfd6. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FIWJZ2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef312d762944c3e39c7c0a1d95ae30c8074d39c1c664b218a03af42820e33963. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/FIWJZ2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5762a4510e38e10fc3118318a7bd25a0a0f8814bfa962fa98d090ec41d043c00. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/GBVEV1900051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dc4291c5aad0b862c4c6eb79fbb51afc98baa1b7eb68c6a9bf4f0ab85470600. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/GBVEV1900053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6417ac64e264dca6917c0554aee3b383c3f051ffb64bf4b064d82f9816d8b0e. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/GBVEV1900055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x714aa229808881e9f23ce63ffb1d54262e6b8935cd7a625bb9159b3abd473721. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBVEV1900057.