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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 0x0676d6608ab51044213b9e0c64085c2f2e99b84e74fcdf446ce830c4476b4a49. 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/997f75b4-56ca-41ee-bd9a-f50f54c8588a.json and https://artists.proofprofile.net/proofs/artist/997f75b4-56ca-41ee-bd9a-f50f54c8588a.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 0x1af9bc41b3bcc4f9f53067706c47d0001cfb33d3afd27494b8549e1b4cc3119f. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/UK3AZ1820504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8efe9d9c0f66a0c70cfdfd8400b7411b31e14a8ed361f1abf847942f6c790275. 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/UK3AZ1923199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff70e71a5c717169ed95d0b3eab48849316b7396f02ba72646cc3b94bc40db18. 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/QZQ4X2200196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeecfdee7b70692262ddc6bb6b31369ab3cfe90ca88756dff37472fc777506975. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/ZAA6R2100185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce0e6cf68e6d20244728b958806d467a5d2498a60c83392e0cb7628342c3f7e6. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZQ4X2200199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x967e30abcf9ef5f1ef9be5963fbf8c6f76b30f5fc592851d55b0232170f888da. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZQ4X2200203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08a11cc42a35b9b5cec76f3aa5a25655ba087ea1fc14b691942d658b5addc968. 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/QZQ4X2200207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5cdb8b61b70ad76c5559d0440f5a7b86c4d12d184209c40e341cbfd41626449. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZTLA2458941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a571c0d20585912d1c2fdc9aa9585d7d9c9b4cf97a15fa43b7fdbd07fec7e85. Chain 2 (Bitcoin): anchored in block 958705 (2026-07-19T08:43:25Z), 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/QZQ4X2400183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeba3fdeeab6f48e0e8751ef8ebea019763d8cbf5566584931652a0febf193f4c. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZTLA2487106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53c6fa060380b7e50a562b4df5e37bcbe2857419bbe2f0b9096339b81a0f4066. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZTLA2497129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde671564393ac88d80e7c64c3a21f29859f4950579cba5d3cc304abb44447c5d. 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/QZQ4X2400121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1516f96b24877956bbadd13f7a5b507be5852b89e6d2ae08b75066e10f63236. 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/QZTLA2430207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa33bbff40e89e00eeef81d68087edc732768d579d2b919a29da95b2f9ad68b7c. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZTLA2538261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ca9665f36c5c7ef027dffc92084154e9a780a9fc02d6fd424cab343b8c413ad. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZQ4X2500383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62441b0e95eb656196cbed404fb7cea8430a4d36772f1958fbd3ddeb4ccf7011. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/US7VG2429766.