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 0xcf007d79e04ca84fc231d5cd7fdbe2436a30ad4f4466f28e80e89a93ec520de5. 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/f4d54992-7253-4187-9814-cdca398c619f.json and https://artists.proofprofile.net/proofs/artist/f4d54992-7253-4187-9814-cdca398c619f.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 0x0750ba3fed223e67c4ac06b0658a5eb4c699ad999e96967a747c82ac5babcf2f. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZFZ42164899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fd4708f998ac5fdd964702bdf490eb7d30ea95aef2aa92640eeb8d73ff6ff3a. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZK6H2141982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0409f4610ec3e75fd57b0861f998213d29313c77d4096d1f95551d06a74467a3. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZES92273535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40d3fcc7a20403fd679ec8e8fe354837a23ddc91bf24f9f17344f981c5731fc7. 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/QZHN42201248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc60a6953edb0741e9054871e6427d2fb948b09110ec80a4acf0138e09c8d844b. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/QZMEN2443354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcedf29598be9c9a9e2d9dd3c3da0f599c8bd91c325b2bfcbddb5e80072bf1448. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZWFM2448953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86f46dbc031e1d41098ac977d25ddfee4864a4c42cc446f89ca368f23dead308. 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/QZK6P2519859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cb546a50d41bae16780a2f9242d6201cfed58d930baad4a763f1b8187e93235. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZTAX2514963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6c0387b305d22932579f2b858de837b95d39970a5134b06386e3d4586c073c3. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/QZWFM2448849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19026ceae5e20797ef0c6c9062dae845b9721b0cc6ed197caacb3d6af0cc139b. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/QZPLS2359846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc758c5e30b6c72b79f1c277f6cbc4f6d0f9f83eb35c98fecae5e507c291c3abd. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZPLS2359847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fe3fc93c36d06d80b140cc74fd66f5d4e00084ead5a4d777e45b944049142e0. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/QZPLS2359851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f5ebe3ba6116327a0f866b08abed8ca358aad47684912b817c270c7a164953d. 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/QZPLS2359853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x140bc67791d9bdbd29f57f2c9bd50068226f3ef540c91641bbd6956b79760738. 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/QZPLS2359854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1bce1cba86d85fb37a024e69aceaf6611c157227f008212b3494efd5449eac4. 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/QZWFS2408528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccf0d8da8471250ec79bec727105de5570585fc7420e5547990c63ca5ab196e7. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZTAS2436047.