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 0x5cd7ec2b414d208a3fb2f0c0784f3abd82c199d18b49040f5c37f038e0ee9eaf. 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/bb6e7c8c-5e9a-4301-9d2e-a93a09ba16bc.json and https://artists.proofprofile.net/proofs/artist/bb6e7c8c-5e9a-4301-9d2e-a93a09ba16bc.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 0x9d279124e4f04a514152063d49825c512bd9a38529878175e1522602dc8fbd7a. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZES82115589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7e130ba21decccb179d803bd433f6c111a24de49742404e9f2e21265c2274c. 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/QZK6Q2191527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbd021adc6e020f1fadc96dbd81ab2cf3da0525d3fec1feb9c6b5cd3cb152f5e. 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/QZPLS2150308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23576d25254c71a3d20fe11a18cb5977b369e5b74f1fcdfe8994507810b411d9. 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/QZDA82254012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fcee133f520c6f4bd80b064e3c582023906446fc698db05af4a06d8a56d8fd0. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/QZHN62253314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17d209e88c6b0ce3c072435e69d877b2ed6c347d5f69e35510ec71e5deadddad. 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/QZTAZ2253485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd334d7c71ddebb49561c1477ed9127f570f4f40afa9dca8ea9be7cad21cec2b. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/ES71G2311094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6881a69f4039e69cefdb04d9f24a9b1db771e3f4ada6f9e8594818e093558d93. 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/ES71G2315734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbce4182edc6e5d4de6d1c97f55b145a7b6352854b90b9fecdea45a5f277b4bd3. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/ES71G2325879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe25ed7d19ceeb3765110f595d303400331dc9a31380e220a81c6c32804319b3d. 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/ES71G2328944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6113aa87dde928ec6c68090bd3a2bd18a3d1d4cd34cab623a7c19c2e3e17663f. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/ES71G2331342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbce4182edc6e5d4de6d1c97f55b145a7b6352854b90b9fecdea45a5f277b4bd3. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/ES71G2325879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6258e94194d2d3618c9b18d46cd6e7a17bc590d53f16f556519e262ee98ac441. 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/ES71G2335445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde910c7996df7cae37ee1692eaa969ac03dbed2a7974a9417d0d66d09b016540. 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/ES71G2335446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81def5f988e432a0cbb2014efa9dbd56fa61ff88ca93c7d6d113405d717cb091. 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/ES71G2335447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeed68affa0367fef8e6b653dc60579fbb91dfdac02080ffcbdabaa1354c72a75. 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/ES71G2335448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78debd598cbef1a11972312537de9009e95547f23825a89059989f6d9d670472. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/ES71G2431805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef4383549f670e3f77b7c32b8f38457efddcc68104de5ff6df88da91c3f22097. Chain 2 (Bitcoin): anchored in block 958106 (2026-07-15T05:35:13Z), 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/QM7282557946.