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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9932676aa7d1a2598c7ffa3f37065b62a73ad8d43bea87ce06d54d49e487c679. Chain 2 (Bitcoin): anchored in block 953812 (2026-06-15T17:06:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f5fd3973-f83a-4515-bc15-fb8dbb5a4a01.json and https://artists.proofprofile.net/proofs/artist/f5fd3973-f83a-4515-bc15-fb8dbb5a4a01.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b90766a14aa5b54c72fa9a9620f50055185d3e0dba78d27dcefcc179bf576f3. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T23:59:14Z), 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/CZAD92300082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f9f4b3db9ec03e845d12a77c49aa0a1c940469d796e344625728b1a9b95c858. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/CZAD92300085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d79e91cc9cc1ad22a9b40d698fd2b78cdc70765b2633e7607d40d3904ce2a35. 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/CZE722300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d87cce2cbaee8a19a99f99667255dd71761d7de0cb9bd5c1ab3de08aae1ac32. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/CZE722300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18d5ad64e788b6b5eab4d83ef150ffc987d850c8af4091888b6f6e77771b0f79. 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/CZE722300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x468234767bd4d4bb35597ecb4aae76faae016e498943cd0461d9e207b6232d18. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/CZAD92300102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4c7a7e8dbfebc3316e8bbbc0963f6a380a56ce7c5398d76ff5469486eed8bbc. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/CZAD92300107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf32dbe1cd841f8b6fb415e4145cd79fd5d43cbf1330210b610add6d0e7ccb717. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/CZAD92300099.
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 0xebc02c886e95c388b062920a37a115d1ff086d35ab4bb93b6d5ca9989ead4ccb. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/CZAD92300100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8628f8df17725341810da6cf394a53b09e69bdce45bcbcd61ce19b8d267afae6. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/CZAD92300101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fd428e953f1635c92687247426a3e051a9f33c707a6b5443629c21cf66e1601. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/CZAD92300103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x094ff4acb30c6778f129acfa07faf02a1c1607cd2a060095ed9f3ef8ffd4358d. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/CZAD92300104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc3d11e687b365d23b9b129233d73e1db8b9c438b0cfe8971624b2e43743e61c. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/CZAD92300105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dcf1ee639348dcb1f001c7750148635c634b1ee1c676e553f45c2d65d0c227b. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/CZAD92300106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2593cb59215cfdb1ecf55cafd88c883bd932397f4af085eddca5e556810bf5bd. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/CZAD92300108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73cefd1c0e9748fc93be10f4b2fa384fb6178397a3a8ed6b9d99445daadc652d. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/CZAD92300109.