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 0xec1edde9dd0c2c4b6d3da8e88ffcd0f954e19d08890475e0ebcb8da32367f82b. 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/5a53ed7a-af88-4604-9f79-a804d0c2a2a6.json and https://artists.proofprofile.net/proofs/artist/5a53ed7a-af88-4604-9f79-a804d0c2a2a6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x8c0b6c1ebfbfeb21194b182c855841e8908efe120d34d11c2c80791c322d00aa. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/ITO101641825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x127b915ff639539f8e70d092eb04aa3b5b12566ee63ac867a0a8ad1c9ee4d913. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/ITO101641836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc386245cf72ad4cf92eb5124b5557fce8fee85efa48c4482499053a0ca4c410. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/ITO101641843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9574ba867a0a616e61376cb32ee02f6d3f565be37dc4a7a954f691ad85efd0a5. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ITO101641835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dc61d46095278a0b7be1d25a8d90859636a3e19d8ecae565e60050dc80b72ed. 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/ITO101641832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbabf7b2a6ff7e41bb66a3f537d38e3f3244e09a7ac6f24675a14ae9194b8684. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/ITO101641841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39c3b7738e5e72377e3fc3eb603c652cf877a9eecae1c66a0c88ed72ad83e828. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/ITO101641839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b332bd4b1a63a31550d47eb564b7d81a4ffcf317e6554cfc637d775cb89ff01. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/ITO101641829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5120f4ce0ea2ed958f6e5b7d2ceaf5f6d38276d9082c0493669b4ef3de5c36b9. 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/ITO101641831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35976dab84d7a23c080a6e9fe312e39962eea0d8478c2426f5f14df3e83cf7b5. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/ITO101641823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57e0750a6e180780058e2c9a261ff1a72bc0847733e16a21f9f245d71a0d3933. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ITO101641834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ca049edc90e58f90c6484a83c0cfdcad38f68cf1ad07de6dd380dfbcf4e29f6. 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/ITO101641840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b8d5b47111b14fceb9b3ec3a6e3feb8c887eb5fe448dcc28a0767a2dada0ec6. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/ITO101641830.
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