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 0xc39d8b096626fd4473d1646939c642ad0f88d64882b47e7fa7ca33634dfb4ea2. 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/e9f88b78-723d-4780-96fc-bb20a9c7c5fa.json and https://artists.proofprofile.net/proofs/artist/e9f88b78-723d-4780-96fc-bb20a9c7c5fa.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 0xa0767cfa4303921e1e6b8f5b447887aac4d3362bf69bbb4b606e5428904556e8. 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/SEYSL1900301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31028b6546f88e8873fbbb9ca91b07f6bba144e1bd95d1720b04c950a8939493. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/SEYSL2000101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4409e386c7188e4a0677ba0e59bbc25b877d5b14474ad5e9f401798c77973e0f. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/QZHNC2003300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fe5e1cfc8dcfc7864c8c7f7077db5b86113b796bef36359cc037436c108eec5. 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/SEYSL2000601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1ec6d9bfac450baf932993aae8fb5d03e1f24c7b5f0b2efff141ccb736b7249. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/SEYSL2100301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x162de2bd409b34ce35ad6d4732bb210f69fe5e74e6ca3d1ba9d7c970d8fb5f1f. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/DEQ022117590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e95954203b8021247db9483ee2141dcfd5ef4ee2a6243e0e21f8b4f10efd952. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/SEYSL2200601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe28e202473043516ad4b5467f04814cc1cd91116f02b615a3b34e3a59951e14. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/DEQ022281726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdef9c9381733ca745ea84b364c82aaa9fa89cd2b481b578775371a8ce26332f6. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/SEYSL2300801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x941a2d0488aa8e87e0792ee625cccdb182840ea36d5dfb45fc2f4074d97c2b0e. 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/SEYSL2400101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93951fbe3222087831a2ba2af2f6d93be40f8408307953e46b54d6d75db3f954. 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/SEYSL2400102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55c873a9e21cf7e9fef34f6f20d8ee09f84eb78c6d532fe252f7b66164d5eef3. 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/QMBZ92481243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ded5f6839e4428d03e7091d16771e7a0a733958032bae4394dab3b056bca9da. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/SEYSL2500101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23b96dbd12421161b0061ce783010aaf52d7b160d610a7d7eae77901502716bb. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/SEYSL2500701.