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 0xbbaca3a084db7cc51b3c67d5c938a4e0be42a2cf24d5862f5716078702c9575a. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/661e7ae5-cc5a-4014-88f9-ed74eafc1623.json and https://artists.proofprofile.net/proofs/artist/661e7ae5-cc5a-4014-88f9-ed74eafc1623.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 0x1452d71aa6af9dfc9719032c48321b4ec8771f452a63470a28c7302018122388. 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/DEXR61900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f13f301bcaa97c11380a1da641ac4714627f7b9d77491071ee755a2c60dfe76. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/DEXR61900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46aae6e751168763b601883f07586bbd8b6e32a182cfa04d08b7d99156c0f776. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/DEXR61900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb90abeeea74bc13e2190675bc491e4ec43843fe56b09637699350a9ed8cbf950. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/DEXR61900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e7afac4516d89ec856fd2dba5ec63fa0b2018f03fa29cc3a9f9b59c862e597a. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/DEXR61900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7990a929c5deeda3da290f50bd6a999d8e2ecf56f0016cd99977cf9e476f16f0. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/DEXR61900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dc9f1da82501b7d6927af4da4261e235a07cdf7ea8b28e53fb4a3c9ae3b6d10. 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/DEXR61900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x163e40573296a6a30b65b93348c21a7687681dd62116d54430a7b24e77f6d2de. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/DEXR61900008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0b42c957505a33ee7e05eb9c01de80137bbcb04fbf726aa05313af0582cbeda. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/DEXR61900009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83ae710edd8da6b2c2d24995e50b0c870fb3e353a27a68a6c943d73f045184c5. 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/DEXR61900010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81c151ed2c45a71871ac81420a4a11cdd1ee31eafc472fc78909411d0d51b93e. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/DEXR61900011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc890c6f1fedcaa6ce8f5f5d9b573be34e370e8ac1963aa8485d043d0e9e3b1b2. 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/DEXR62200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc32704002a427462ac0c4c4c00fbac4980ee0fd204a2df909a4b7efac8e2abd5. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/DEXR62200002.