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 0x2bc349d3f17260601fa6b37e612d6e7ebf6ee73f95c68e572fc85a8a5bc357c4. 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/8e29d602-f15d-4023-9338-a474f9eec900.json and https://artists.proofprofile.net/proofs/artist/8e29d602-f15d-4023-9338-a474f9eec900.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 0x60b55f23f79d5a688682546364ee6fc0d62ec84a9251217006f186e1fbcd6ddd. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKG731910517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8b525d7f3f8e91ae6cef7b8d1f76a016228689f729c5769fedc5523669ab6dc. 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/DGA072466979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x474541c08df3aae7b901364b154eb2e2a64fc96332e0514705e76addc90fbefd. 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/DGA052495544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91772df67d120889614fffb4dc950205b2d41ac294c569f663032b87c88714a3. 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/FRX872433515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91696f461856753541898dcfcb7800d24b0acdbae000f66716896bc31b9812b7. 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/FRX452430289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b9d44eaf94ef1570e682e1b111d60ab55621e4b29d3b45348bc1f771e51fc41. 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/FRX452430290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf855d2f244bbf39b09b361a25053189c5cc7de446bbd647e54dcab629e5ade0c. 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/FRX282429988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e7150293880edb7048a5ea755e1bd8944664416cc79454e2a95374e6d8a9c97. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/FRX202442391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fde06168be9c1e02cf89fe3925ecedd58aa8d46cb8e9dc777c835f9cc855584. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/FR96X2436793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10c84a75586dc2221d0d5e8f29fdda5fcfcaf3dc02854e94f7ba14e27a64c78e. 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/FR2X42451748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc10ceccdaef9ed180b1bbff32babfc7c0d100d43c5341a0843d41c5ec64806b. 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/FR2X42419164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd15924d6714c998c9816a259bf9409deb0f88579bdfc11aef70c1783aa7a99c8. 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/DGA0R2315399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2400aed374c6754b20a79f6ab32c19b72527674ec94450c3fca618e2e12a170a. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DGA0R2315401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x152ff5635950c719243e0dcde951b080ed7734601bd926aae19d91989c8c26c5. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/DGA0P2389501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28795c8f5e31b2fd9b7509cfa873b2f1da1ec83733e074b7cf93e0a1c5a9d27b. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DGA0L2319417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c4df60465773785f445b91d3558e49764327801f7b67fdae6902edbc7a9c94d. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/TWCT52329712.