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 0x6e9c151a896d8d2358a3104ac66e958fc13aac1fa8e8f3e8829a2c731d61dc3f. 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/fea01821-f669-4bed-88b2-953f9acf4e41.json and https://artists.proofprofile.net/proofs/artist/fea01821-f669-4bed-88b2-953f9acf4e41.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 0x4ffffd7e16dd868f2940b0e40b2d7d56416133f68b9a43e7bcaacbcc009a9d11. 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/DGA052088349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33d17c35633adc77a0046cdded2ebe647569986b948767d54abbe531703c3ba3. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:00:38Z), 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/FRX762106227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9266bc40cd007e854219e1860b9192fc13d0a0f035b0d8bfed0baf4b52461c9. 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/FRX762250887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd494b1afa4a4cac30392b0e1a14c192f33598f5933817ede79fca88a40cca8c. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/DGA052350818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x638b1765904e921f916cd2f8465e6d6de170c3aa025b3cf126ea87b730cf7162. 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/FR59R2466973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1249a8de0d036bee859b2455fff735832b485bb805071bec811c2c7a5de53703. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/FRX202409889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ac1130cdf1e3379522c2cb61c12dca22f108337be2ba13ac88328943419b9fc. Chain 2 (Bitcoin): anchored in block 958303 (2026-07-16T16:39:24Z), 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/FRX282408813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b26b8d27c0fb82f2465f7c9b00859764c3652f89c315c0ba1400a14e71f3482. 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/DGA082499150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc970eb4cdf5d67283cacb83b7ac41835048f4bfdff4606b4459464ff49e8f903. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/DGA0R2445664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdd1aed2323883a74bfa52bb27ee367761a5885f16982cbe4f680f9633a16a05. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/DGA0S2427488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc035bb10d442b6410f530174c48657e539e1529f2338209bfbf8ed843b8e270b. 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/FR59R2544504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe03e86cc9d69eafd02168272e568fbc66e01622a7699a9014ba0258f231c3437. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T07:04:02Z), 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/FRX202513869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae7f50adedb291076484bf60cabaa1f18260507db528ffa30a969a24eccaf6a1. 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/FRX452578768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa52236bf95ffa55c25f986e2bb2ec4301231027ec7c99ce5a8596c2c5a6c78ca. 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/FRX762576911.