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 0xd2234bc624adb82eb17dd68136ec89038c4fe90cfadd18dd85fc98d9dc9dd6ff. 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/9079ef1c-73f9-4cad-8990-eaa0e7cccc44.json and https://artists.proofprofile.net/proofs/artist/9079ef1c-73f9-4cad-8990-eaa0e7cccc44.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 0x3d6202153263c14300850575ffbde27eda046eb82d4f9d97f05b20c813a9ae91. 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/USA2P2100261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x194fec91a5e1ab2fc6319ea8c3514671ae7da76cb5d31326dd6e58dcfdf61a9d. 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/USA2P2119166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd479f9ec31f5121e45916b521f8a34682acd02f6768386ec2ba04277be866a8. 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/QZSYP2141645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e96c0a56fa2268f99e884e44ab29c63d47423d11ee2ded62460d89bcfdde8f7. 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/QZSYP2102780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8770b610362a1c8dccd701e57582780413cbe4f52ea7d9c14a7777cd4dd06892. 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/QZTL92118662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ce4fc74e0ad494cad5bc91d44396d1811f17c2951b791a8998ed0219b26da15. 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/QZQAY2264180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x034fbd914c8a861bcbcce3e07e296dbaf2be8e8e39655e3d0af95040f0c26104. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZQAY2339068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dff1ce62fe6b25f364808b239e18070eb9871f8026f818cd04db7cac4c0e40c. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZS7J2316269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bb3fecf460d8f84bc0b67a160fa327106f631132362c047e1dd99abf5d78e6e. 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/QZS7J2351773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x049b0709a4b2192ecdb8144325384cf959a705f0bcc6b2b2cc4d7bfebb1ecc62. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/NLRD52119906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf823821621770c19dc093fcd3efa2fe17dd2bcc722466361eb3a9ac5ecf0665c. 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/QZKDK2047569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f0f45067ff23955b07f6931158ec652711bb15268ea0a0cf511c25271f56fb3. 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/QZS652220932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x619f505eb50372e4ecdc7e4fb94308f92248fd60eb477c3faa0a54acc10ce75e. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/KSA002303245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dceecba910523ff5089019c582cff27786e09c8b4b25bb0b9fbcda1384dfe0e. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/GBKQU2267523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f0f45067ff23955b07f6931158ec652711bb15268ea0a0cf511c25271f56fb3. 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/QZS652220932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c5e0a35196636b9f38ecdbf991fbc825adcfc246a1115b1af5e2acf87e3244b. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZS632265781.