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 0x706fd3c792ceddc708a5a7056e2bb9888c1503893913f6ab4bf935a7afe42c2a. 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/33964b5e-4943-420d-8dc0-f6edb5f45104.json and https://artists.proofprofile.net/proofs/artist/33964b5e-4943-420d-8dc0-f6edb5f45104.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 0xc9b389c1cc47379eac8deb90a105d1843352a2a825dc1bf2e3227b2fbfa09b29. 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/BXBV71700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7e95b56e895f873b329c464afa23fe0b12b6986eade070eea3097099beec151. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/BXBV71700005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x998b7b8627695fce58915bffc52330519209ec472c24dfc5ac8a699210919636. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/BXBV71700007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe58da51a420eaf66e75450f2c7da68be224364873e96232227ecaa2ebaf51ca5. 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/BCATV2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d130d70e8fdb3861636b98c4d863117927cf328c945da5d42a5cd0e87deb740. 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/BCATV2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b6ac38f68ea277ae0b520211ddbd3404d252424f178ba9a31fbf2a7d3da7c9f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BCATV2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf352a2605d6b3e68e1601bd6c6800d7d10805b238e54772d1409d3ba475008cf. 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/BCATV2000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87e5d4a293643abab3121411f811c0459b8f6429bb4c0fd1344e79bc9b1246b6. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/BCATV2000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4b1fae962f3d86f3d41365db1f9ab0b1fc0ec0753c1cd79a13803aeb6fb417d. 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/BCATV2000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7edb5014adea3953d9bac358900499163eaa37bb51e67c95e99b46fe3ab0d21b. 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/BCATV2000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c704069cf6b200c08ea4dd4ddf389e77fcbb8a38c4484a1b7fa5bd9ac261c03. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/BCATV2000009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf14549a0e7c44c068107bf31bfa77aa1b96189530767e7df8460c699c0b5be8. 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/BCATV2000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5550e044fd6d74391144fddccd75e5c5ff067123f5c66bc98e4f67c5525ca66e. 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/BCATV2000012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4494f6e5f42a178cb45d3308c01e466f1c46808e55d22b5f680431259b8d2dcf. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BCUXR2200020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x464bdf2c5dfd9540d6367514af0f27a110d0b42ecbcc0387835fe7bb9943834e. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BCUXR2200021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40190345db5342d5da921e2e43e29d95147ebad9de55fb13714bac489a294cd8. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/BCUXR2200022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dedc1bb8e577cef3a7b124281af3a80cff2b21ecfd031ebde73e2d9d4671fa2. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BCUXR2200023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68bdb43f06d4a3df57ded1a473d948261a1290cb7bc778350bc2d1e6945efc3a. 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/BCUXR2200024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2df36d10331fe377c7a13a333163fd7d880d5bd463c7b830e67d332a136f7e76. 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/BCUXR2200025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb270d542079bc45d4b490728b0631540cb9facab820a6aa2c1b0f379dd815b0a. 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/BCUXR2200026.