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 0x21d2ad08f8139a01cc7f89c1a9037ca5f89f9ed344a14aa95fad3e25665fdc80. 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/62f71417-623e-4a36-983e-35542d18bd48.json and https://artists.proofprofile.net/proofs/artist/62f71417-623e-4a36-983e-35542d18bd48.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 0x24cb984da54c762bc271c0f108eaa9800e97bf4e64138dfa48edabc3ff988753. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR9Z62100114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe619ab28260feaf1007881ad11dbc88abff50cdfcb9deabed4677fcd5b5c26b1. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/FR9Z62101164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe619ab28260feaf1007881ad11dbc88abff50cdfcb9deabed4677fcd5b5c26b1. Chain 2 (Bitcoin): anchored in block 958491 (2026-07-18T04:29:42Z), 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/FR9Z62101164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdfe1a2d056366fb021a5a94a7f5dcb93dbb26161cd901b6c43c89966b471b08. 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/QM3DF2262860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8260248a31b6b2a4b1354d6d88de8e69cdff25ec8b816163c91d43a32a3c856a. 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/QM3DF2262861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cf5a43c24cc65a4b154e0cff68849952b2e2099bf66457b94786626482205f0. 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/QM3DF2262862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13ed6707e03fad6401de54309908a29cb87825a273824d305a944cd2788924d6. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/QMANG2248379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13ed6707e03fad6401de54309908a29cb87825a273824d305a944cd2788924d6. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QMANG2248379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bfa846e3038bf19472cf8ce885dfb97a7aaa38027721c2f473a1d17235ba071. 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/QMANG2248570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fefd80104e35519feebe5f4b4c8f06096a5b4ff0d5c9a4817f2936378513876. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/US3DF2417942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0acd50007c4e165d875a1d7ea3c5ed1a07fd6866e958853429513cbb3da4d05. 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/USANG2430010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91376a22c62906c4db11dcff0e1f9f99567f6d9f5307ea09eb8a623d0ec3487e. 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/USANG2430011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x689e35c1d51a6f8f82d628a4b2df7dc1cad8e6f83af60965651ce1650f10c95d. 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/USANG2430012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc985497e13cf3b901c167372189b65f95bed8c65820cf691513d90b651fb540b. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/FR10S2542652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d161df7d35691101de24b6d420ba31db953aac668c44e34bc06394be13a0781. 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/FR10S2542653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeca4f767d54275a1c64b281567aa161c63cd32b714bc5ee850d60eba5d013900. 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/FR9Z62500211.