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 0x8f07b4ded4ac64ed86e214157f8fbdc0e7bdf8e797abf32ec11dcd29856ccfff. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2ddb64eb-07d9-4699-ad41-478143330040.json and https://artists.proofprofile.net/proofs/artist/2ddb64eb-07d9-4699-ad41-478143330040.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 0x3970ab0abcff2a81c79b278200df7a4614c5515ae132c4520c1bb3c0668490e1. 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/ES71G2008664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fcb19cb0ab621d9d3ef7c3b2fc5154819cfcaed7783c8864ee982e466c64a21. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ES71G2008665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7deeecb8be6dc65c28bd0435c182dc554c30692b21a67d71783f5ce34da0f90e. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/ES71G2008666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ccfb8910f446c6d9a57d39c64431ca32753d9dcf92c5642af53fc6947342354. 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/ES71G2008667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd187ef362e95828f4f6d28409d1fea6b816608c61e388090245097c61966a75d. 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/QZHZ51978521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21a8d0695e83184a55c0f8a2103aace5ce76efe37c1e97d6e45d3fc9d565eb60. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ES71G2008669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae51f333524e635d97486c96f98c911e860083e39e332ea5833e386d847855bc. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/ES71G2006598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x147c2888f88db702bdbaa93d94b4805008aac37098560dcbd1833bb87e888d8e. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/ES71G2056781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x357aca86f734ef45c10f5bc893c934e03cfb0a588812b17f1c1a25edfb3ba2b8. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T20:38:50Z), 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/QZTAS2193547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf71a191c9240cd9528c905063c25b5fa776cf376be375253a1610d55fe864e4. 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/QZK6P2295896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7759c75bf91c5792c29ee349a643dfcc5b76072334feb884fe7b763f87fbee8d. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZHN52454667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74cc119b6a59725893a5975c37b107b580d96893fe2151d5ac3e97b599d65202. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZHNB2482038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x305b78dc856c71525ef1a60b6d4d4ba396dea4e72434e38d6eba395cbfc145b3. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZNWQ2470996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d23d82eb9a9beda4bab382c48d4ca4693d246e3c639dcd7d58d5725598ddf8d. 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/QZRP42546423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2fbf54a5411cd4713fc82002dc96a7fe066acfa719b93a3cd20174698113858. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZTB42515384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4e98279a904e9b6dffad7ec6ab83a6d800127e1f5426d40df0b9094f7f91c74. 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/QZWFK2579326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ee0744e282e9c95ce29a6f203d02ebdeb5dff2c69c6e70b4216ff00d2d04651. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/QZWFR2576865.