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 0x74ca556187e4cf9c7f43f95c603c808a667d9d42df2a3652c4174a1276d6a27d. Chain 2 (Bitcoin): anchored in block 953875 (2026-06-16T02:12:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/085098b9-a864-4daf-a15f-d3df2f2b04a8.json and https://artists.proofprofile.net/proofs/artist/085098b9-a864-4daf-a15f-d3df2f2b04a8.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 0x57e74e34dead520dcd85756ec6b4d534de8e3488574c998ef416944671e73a0f. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FR96X1987198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd81eaf8cb67c86db0d0dfcd7f6dfedf4f0c089897d823b4ffdc857de3c7373e. 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/FRX872190488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6174c5f7cb84d8d436a8b01ad816891099e39dafe3356ee23fa440769e9dbad. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/FRX202151398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fb52ceff2f10785d1f2c955c90849ea9fa49f0ba063c9871cc1f39fd3347924. Chain 2 (Bitcoin): anchored in block 957057 (2026-07-07T15:21:38Z), 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/FR96X1923232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ab889c867f488a41d10a1bdbe1d0fb49307edcc5ae09cea748740f98689dc7b. 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/FR10S2058097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6622a6bab49b58f2bb36728fffe5461407e77a2bd5cd13bc2f29b806298592fa. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/FR2X42206653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd81eaf8cb67c86db0d0dfcd7f6dfedf4f0c089897d823b4ffdc857de3c7373e. 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/FRX872190488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6174c5f7cb84d8d436a8b01ad816891099e39dafe3356ee23fa440769e9dbad. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/FRX202151398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fb52ceff2f10785d1f2c955c90849ea9fa49f0ba063c9871cc1f39fd3347924. 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/FR96X1923232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f8a3975ed4eef59af3c734a9c88d7ac8c1de672c898b58019af80171f2d1ba2. 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/FR59R1738832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a8edffe8e9317ce9bf53be656d08332961a1f9e74645d680c46197d197ae500. 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/FR59R1738833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6421c5a923b509e8c1bab24599de887a7ab62e070f243dc58d09b4b9d1561b94. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/FR59R1738834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe96ae4c065b1bc2814829acef795a6a1c5f6a55b6579e6018f24288b66d4fa4. 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/FR59R1738835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72d3be8f66cd0db9c6a02f5c495f8baa6ad076a8dacf2fe9468097760fd6c449. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/FR59R1738837.