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 0x252ef9e3269a123382a38e4a9dab13b36828974a2bcfbea51b7eea93e9a92688. 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/b4ab4986-4ff4-482e-be82-6e66c0ea53ce.json and https://artists.proofprofile.net/proofs/artist/b4ab4986-4ff4-482e-be82-6e66c0ea53ce.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 0xef04ba118a122331d11e1fb20ae499e3f9bf3a529c6cb04616f6efba1651d391. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/US83Z2227166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7a9053477455f8a80947cb74ab3c48a1613503189e7801036355d0491840fb1. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/US83Z2227167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d583c8798887bbb9a455e6a1670221cc6184f0b5e7b5efff36702749bd8cb70. 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/QMFME2205721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4b955fddf2e20a34caafcc65e1c07bb60bbc324623326dfd4ef3e892f6195cf. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QM24S2304566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x639da2b2a49aa2ad0e07d406a4143df325bea94693a0ce9bc77227efb4dd4285. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/DEY472376946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6d830cf9313c0eec73765f5b47407c1bbed0fd8560f3941cd29800d402b683a. 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/US23A1583086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ecf7b0d01403e4c805741be4a0702bca59665b8196ad1b38ee7978250408dd2. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEPI82433737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04bef749e7fe98fa2baaf05f826d41e61867e51d42927a9309e6d2f87fe1b44e. 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/DEPI82438484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59c981eb7aaed0d3a568cddcf9811a0e3bea959b053e68272aa2749282d0413d. 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/QMFME2203593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d583c8798887bbb9a455e6a1670221cc6184f0b5e7b5efff36702749bd8cb70. 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/QMFME2205721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x544fdd131d8c0e7bc46609efe8eb767bebc2bf3ee2c7cecf7df6edb3433d7ee0. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEY472271276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f8f88cafbb2c524516fca3efc1b6d536a3ae9c969104dc659658d41937c98ee. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEY472180214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef1b9da50b33501331150e213e4b1500240dbb4f212f8f7c2cd9b24ffb06c4bc. 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/GBLV62215082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a028357285ac46f6b3861593f738eee2585deb0596c07d2ecdebe3d1dace5f0. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/FRX452425227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c65d4fee0e040afe571bd9037fd6e742d166ed0fa3234c854eca610a95b12b8. 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/GBKQU2401098.