Carel is a given name, and may refer to: Arts Carel Blotkamp, Dutch artist and art historian Carel de Moor, Dutch etcher and painter Carel Fabritius, Dutch painter and one of Rembrandt's most gift
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 0xdc858012b15a3b04d6bf597a337a8545c4663c376f52c75c93f676434ba3e1e1. 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/b93210d6-76da-486a-b11d-5b991192db34.json and https://artists.proofprofile.net/proofs/artist/b93210d6-76da-486a-b11d-5b991192db34.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 0x5b1d116b0bf9b1316565c0f5dcbd96b8bb57a7fad34e22f9c1deb3706f8a0776. 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/NLX1N2200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8255e5cee032a0fec2fd97f7d809f96911ccc7135c021b28762ea9ee7660077. 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/NLX1N2200019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x130ea6cb0620d259ceaa1a9339ee6b2e602d796f6b4db392bbcb7bd62240c2ec. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:52:40Z), 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/NLX1N2200026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaffcfb184f82752714d722d6761207fa5ba055c19824670775796b6e0dce998c. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T19:02:40Z), 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/NLX1N2200029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3fbb5e61e6c910e8f9531cb496cbd43f41a4049e6de38c09bbb238aaec2bdc7. 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/NLX1N2300019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd27b653919e7c4128ca0d3f816e31038d7894dce0e5776fa38480514b6c0f4a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLX1N2300022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x837601a88cbe4d7fe4f1f60a862060501596727fcd15196f9ab97525805bcf3b. 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/TCAIF2439273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x837601a88cbe4d7fe4f1f60a862060501596727fcd15196f9ab97525805bcf3b. 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/TCAIF2439273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5583a895476fd8497444dae0c39ad55fbdad2229fde1c96c43b27b3250885696. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/TCAII2481773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad86ee8e3354f49285f891d6ac39ec40e61208d79143d0a7d9fad8872e4f4f00. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/TCAIN2458213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x417fd4c30fe21d582bd74fa1be485341f39f7006fc44776f7163907372d85bf3. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TCAIM2458220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8489d47ed53847d69efdb5d036d6f45e9402f704a04ea861a9e5f1de14d59075. 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/TCAIM2458225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87b4b26ea51ac864dcf756cec428596ed47dafe712c8b4a88bcbee1c8ff14a0e. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/TCAIM2458227.