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 0xc600d713766608b5608d0680e3c4d8183faec6eaf711a037d4d000f12cca768a. 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/ebd95836-39fb-47cf-b126-8c71dbe31af0.json and https://artists.proofprofile.net/proofs/artist/ebd95836-39fb-47cf-b126-8c71dbe31af0.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 0xffd5f6fa142c50835853bd5b5bfa1b474aa8d024f62ad4dc6d6e728dce06a66d. 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/USJ5G0831701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9efb27731624f609519c21c82ab69c132f32d6bcfde14c71eb1e22247fb6b32a. 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/USJ5G0831703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0eb1e70da3e39279804bbe4d7de38289a2286d5bca0f89a62924b78075ad70b. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/USJ5G0831704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8681301c53bb51747e0d09f434ce361e41b997fa36ea1e2f1aff74d0ba57a5f5. 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/USJ5G0831705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x728cb44f08465060c9f3b10dd789e06253c8e81e69116d05023168c5da7fb349. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/USJ5G0831706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9526e4521f5d51e81520ec17ab18d664393e63f0bea8ff57ec0496fa2fa341e. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/USJ5G0831709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bf83d24b759d2860c740c3354787a415bd5aa2ee8c4906b50888b963d16a398. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/USJ5G0831710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb1df1b2129064387cc016f9bb32305072a435366fef75fba3c4a182f857cd1f. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T16:51:27Z), 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/USJ5G0931801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffe22038ca15765da9fa66b0a869b1317681190987e8deeaf88a07d8e4c8b3b8. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:36:38Z), 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/USJ5G1203303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe4e9991205d6dba6e2450da47351bf69b08d7e50f594ca61d6f16bcde37d8f1. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:07:16Z), 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/USJ5G1203308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37a733e26311e16d3abc31195a722fe98f9057429f2c8b399bd29a7ef658b079. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USJ5G1203309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b50f482a2abda1102eb3331b41dceae5a86ff32760f9c80f0a17bfd0b9474ab. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/TCAET2013329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x611094a6a6197542714aa56d095c20134bfa4e1c9c8fad38c1abde158fc3a491. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZPKV2000902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2ba9a95bce4a7fe9b48f5c382d548579d69641e8241d8ad7c09bcc78791f5dc. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/QZPKV2000907.