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 0x4195effaf1c4285df968f18ae538cdab17d7472888288349983fb86cf8c1a80d. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/60dd46f2-d67f-4e8c-8121-3ea397cf5960.json and https://artists.proofprofile.net/proofs/artist/60dd46f2-d67f-4e8c-8121-3ea397cf5960.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 0x6125c4dfb2084bdef87feaa5c3393b6a5dba770c6647aed2933700c16508cbae. 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/CA5KR2381275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e14e7f263764f87dba8ea2de163b6dae05cf034f32a12a79d64e6a381fa7232. 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/AUK3B2400041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cf0fa190cddcfd5aa7808e846d743a4bfc2447e5a9be660bfc5cc8935bd6a09. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/FRX762401854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36dabb1d6d8d78a0125ba1adf02d41ebc3d67dfaf895c7887412cb9a1b34934b. 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/FR59R2434855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf1afab6eee3a593513e3506485ee555aa0b6d5489f1a52975b3ba263913b1d5. 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/QZMHM2271427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x489ecaf1cc6ac202c39b7876d02105fec7eb2eaaf7ea00dec0346aade52d74aa. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/CA5KR2379062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d09fc06bace7b2b35f8b10f21c02c6d379a6c629a4f8d873e0297ab9a4b8e02. 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/CA5KR2379063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f09bd13f455a856f659c7924b11b0c6d7a0edd9b9e8388bb9f786fc86d8e9f5. 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/CA5KR2379064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd45f0032c0f9992795193b5088e25e7a09db02e1335e4c660358e8c24b6bf72. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/CA5KR2379065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e39257c6c124edfabd910013a96b66105bfe18455cb397945a6d2155d7db2e7. 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/CA5KR2379066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfadddda4b08f66fb840ee555e4206697e6900c215f2a5f45e1b1b151142c2ad8. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/CA5KR2379068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c5b3e1fba989f9540f8247d8b337ed4c8a59ce4f652f809dc5bfc64f450e411. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/QZMHN2241852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f2ee2030d119c083a193fca334966b70233607343c29ea2e6b22ec268b25a12. 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/GB2LD2210048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6f1a66b52961cb0b2833bd35207d153f3c4680b01d852efec11dbf268dd18bb. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/CA5KR2217544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51b8e989cb2122a0a8d0fc37e9e58cf1d20c529d4d89b47459814ab1ea48c0ad. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QM42K2138259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb832e2a21cf0512bc3423893768fed50018fc49b5eeb973b882123a8bb10271. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZK6Q1949885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bc778d4b8b53641648cc84b71a711f5a73b5937840d582ebed21130e4c3e18f. 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/CA6D22400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5563f188f251712745e18498cc59ca70d2b59189cdd34a85b77b6a4f3c7397a1. 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/CA5KR2183094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e63ab0b54cb89e05babc4362c34e896a644eb03e0d5804b134f52ea8a22d0f9. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/CA5KR2452457.