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 0xe87cdd4cd3d02e09b2c55723b1c028815d95ee94cf06baad2d8a932321715a30. 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/21deb677-af0c-46b0-a279-8c35d6c59d73.json and https://artists.proofprofile.net/proofs/artist/21deb677-af0c-46b0-a279-8c35d6c59d73.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 0x6455798805ff250e0bc4d32f6bae3e3a2c4892405c61650a96a46f9b9fc98654. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZMER2116364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb635aa1d16de16447077709f19ab3321cec16d626853d964fe012b02e72f6faf. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZMER2116365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x611fda531c9f13bc0f8a1d1c8693a76e6bcf707ba498ac2648b2b5cea9be69e4. 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/QZMER2116367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x944769438481937ea9922cd08b6ad9e49d81471e23cc8126855218711d88e0f6. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZMER2116375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10eb8df50b50612586568bdbf0e02deb654f1558579e02816852bfcef85e3115. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/QZMER2117895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30a18466f15ab73e0231dcc9ee4229800d06887ea3be2e96652472319d09218e. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZMER2117896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aa7a829e464cc8c8295dc9d75534aa6a3d9b523bb98da79f5a81bae99e99f08. 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/QZMER2117898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa46596e9bbf5047dd4ac49766666aa0b6c2cad9c6d5be07cfeb1c19aac26d8ec. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZMER2117903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa568979e76ac6afb0bac7f5c3da42a62a89c4fb5af507781f335999c405b1e6. 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/QZDA62247015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf24a2eae6e47f5330db31c8d1be2025c4ad0d57d8f6ee40152e979c97955814. 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/QZDA62247018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1d3d14dd4011fcf6a4269a7802f450173d2157f6650715626e5e229364402a9. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZDA62247022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1447b49c4867d6944f687c0c492e2ff8192f94534b4302180dc21dd2440ac626. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZES82268054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x890a0f239aad06573a85d7e76745b95ab94fcdf3b70ead7fb78ec269a564e680. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZES82268062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64cd2d2ce4d18a494b2a8cf22a506c7a37bc0ed06e46f9f45130c3529168ff62. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZES82268069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83c21a40edaa971741ca7ef7a847ba2cf8f4b3a6353c4eb2622505b8bc41f32f. 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/QZES82249718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f024d474e0b6c08dc711adba78ec091337ea33ee15d1cde7fed7e06f102ed9c. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZES82249725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59c2d5c3aeecef03cc07606d2f94a97887f550a3eec7c458fd2ac08f9270aee6. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZES82249729.