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 0x10d96721960b9df88a2130faa0e8abb1bd3a212a0ef68581af018a9dbf02142b. 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/8a82c801-4910-4433-964d-774b85624087.json and https://artists.proofprofile.net/proofs/artist/8a82c801-4910-4433-964d-774b85624087.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 0x969353fcef5f49bc3315174673f48cd0dc4af145428a50cc209c06c63c2f62ef. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZFZ62230353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd115fb11f1395c0c012bfdff21f670ef9bd3b6d7c8c51dfdfff40605e44b90e5. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZFZ62230355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf70c21130cba6c9e6c57abe776424c1cc2ba7af17fe606701be31b9d0bbf2dd9. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZFZ62230356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b3e64854ffc74e080ed453ee83ecbdfca1763bb9b492404c8a39f71fb5da731. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZFZ62230359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf096b055d811cbc30cc4e4764bbc5a6bef28940fb8f4657900e0553a691d2835. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/QZFZ62230360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x740efedaac16b99ca691a5c2b79798857bfdac73890302097770a2849cead83f. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZFZ62230361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x182ceb1e9546f0f3801af2c9d622f8b5d26aea9e5d62fe5e9d76ed13d585d607. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZFZ62230364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce9b4abaf61fbe8f94395f621059e4a38c98b2449c8b818b94f52f9d29574c5b. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZFZ62255054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6deae1a313752ab26027cca9bf252abf777da1298c3f62a2c3bfde7fe405cc96. 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/QZFZ62255055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffd1ed671c3c2d4925b608f744efa75bb2b7ff57219d4d15117dc40cdbcd9981. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/QZFZ62255056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53885a3bec806e65ffa1ca72444e28062b8b7258e5105e45d6606093f29a39ad. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZFZ62255060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4324dc0b32f1e088fadcc73750047a72f794ae70b25df019e17ca51d8e1e517a. Chain 2 (Bitcoin): anchored in block 956397 (2026-07-02T21:02:00Z), 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/QZFZ62255062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e84b11faebc82ac330d4968acde00d2791085887544e5c5b1323e2e780e929b. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZTVM2363652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02bd87f1bcad229710fb64ed60c22c654e5ddfb51d74c1f975bfcea1ca6d88b1. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/QZTVM2363653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfcd249fd398bb8f6e5aba42817a1c3e54d536e028987bf2cef7d336a9709cf0. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZTVM2363654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee28ea6af65513e4bd3471442f0f9aa52d8fa20a3c9f0e88eb6d741e59f99757. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZTVM2363655.