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 0xe4fa214178d795053a02f9a2d035a882c02be67d7d963e29fe6794dbfdbdd2a0. 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/74e35158-4b51-43ce-9081-f90837c833ce.json and https://artists.proofprofile.net/proofs/artist/74e35158-4b51-43ce-9081-f90837c833ce.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 0x084450f3b1e4d375962fdecb8c6206e585884f5c4656d1e483f9c7086db68e35. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZVR22400121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ccb0153a941f0172bf67b5d6297bf510d8f2b72907888a5a55bcf44bd9fb174. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USZXT2352250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d7641452969e6829e8a8010074399b84af3a70a8114008aeea2d8e6212f054a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZVR22400122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x435c4cc42eaaaecdd0d13c34ca469760850ca1c7521a668a74fa345f03e86d68. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZVR22400125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5a63b16dac727a0c04993fd497a52f529de916509a9ec35d0c0705e5fc3fdea. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USZXT2352428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef7f3dec939e503bac8e9ebc41e9de329a984bba49b0a4100b669619c5ead104. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USZXT2352449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66fff4f44286de361c2cec6a817991b9eadace44187bf4b0a1aa60a0f571f0d5. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USZXT2352427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8686e0d1556e0cb625664d919a9fca8cfb7b6d4ec0de8b40e5844490ea0bc28e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZVR22400124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15284fab12a1e5851d67ce83e38c56a062e048aa378ef8367ef0b630c1a2fff8. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USZXT2352033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dbddcaf230585d2c16c62abb2c11422bb78d3d84b8d9d67eaad5c6298df3d9c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZVR22400123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09cb2cd7af3a3e9d5aa4c47b0d8cd481de58444ecf74fe73228effc5daff2802. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZVR22400127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb729939908378b43e98425d3fb70b257b055de2a8c7862fc77ee47935e5ec5dc. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/USUM72408124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d7641452969e6829e8a8010074399b84af3a70a8114008aeea2d8e6212f054a. 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/QZVR22400122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2cf57d6078b1f1a8287aebf2b9bd957467e6a9e205fa309fd3811f51a309f2c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZVR22400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7b42f2fdd0957f12bbfbb3c02a54422da2cccf38a769558ee55c0db01b99678. 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/ZAUM72001522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60a51e28f35c821d8a5da65d698f92479395846fa8c257a679ca2e416c62ca6c. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/QMGAC2000325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d5a87324772ff48c4073cf40a3bfcf15da58be39f4a3dee242663e0ea9ae732. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QT2392400025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf626c66f4aaa09d354ed29f06580e23a0580369e4bdc85541d1002b02b498bee. 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/USZXT2351157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07f0ee0d10fc51c824d7fd401b97f3089ffaa1e1c23c3eda4a64e664055af681. 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/USUG12308003.