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 0x09924f65752a9d18a859ec4e4c69f997476821466747c0c79d9b6ef2751259d6. 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/0d9dfcc7-d1ee-4c4b-a542-afb69d83b5eb.json and https://artists.proofprofile.net/proofs/artist/0d9dfcc7-d1ee-4c4b-a542-afb69d83b5eb.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 0xd2874aa1a6e52018f092ad2a4d3dd81861b81dca99b4c99a07a5b4169755628a. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/US43C1614251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29c65e67d32f4abe9ad1abf755b9f9e741f50d27447651fcb28cedfffda3b7f7. 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/US43C1614253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02e41a974facb4987e4763a2cb215ff93ccab9cd64105b95996fdb5c63b49a62. 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/US43C1614254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa869ae50ae304ad610d0bee927f0b895a4ad2468cfdc36ab81ae631559f2b142. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/US43C1614256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd95ad3312029b37fae965e6f5496755bb754422cf76393dc761752ffc3cd9642. 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/US43C1620276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56fb0d32f272a7f66b89057d661f5fe99ce4893ddb4042f11bc9aead9a5bf34a. 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/US43C1625347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6744611ecb0d56856dafb7204468b21889f93f6240e333e7244ac911c157e6a. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/US43C1626725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96cb9db41ec8d3149074e5139651508ed488c46034afbd7e33dd74178daef815. 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/USA2P2415428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4918d6102cabf5952975e676188c252a437821862dd0f410255611a9f2139af4. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/USA2P2415429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6c3c643062cb0f8688eaa3125ce8739e2e47e13476aa0ad4e3329c1140022c2. Chain 2 (Bitcoin): anchored in block 958579 (2026-07-18T16:26:17Z), 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/USA2P2415430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b4ba8426c2df0867fe7f09b13b6da0ed569b61f1fd01fe468df458aaf7c94a6. 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/USA2P2415431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40f966b0f5e6aacdab903a63ba510e5b0ab05ff6cbfc3c659868625bf62ec488. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/USA2P2415433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcba0562b51e94632cfd8d6a465afde8f1f577dbcd21ae09461105425ba107d54. 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/USA2P2416136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x563f94e10ac439f4e90df5e62d7a39d540e8633416a0123657f504b5f1ea78b0. 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/USA2P2416137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a1d4a734e5a8789a51034ba80b90815fbb72a59877b4bbb4774821f4f0934dc. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/USA2P2416138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d860dda341cc0a5bf45dccf0e5ca1bc9bb886c714baea2410d40e76ac7dea54. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/USA2P2416139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d42512d24260890ec500660b14415689f9618154f31a15881b64382e8302b3f. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T17:17:04Z), 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/USA2P2416141.