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 0x31f7dc2d4034b407c713ed0991bbe10cb716d71225ce5567d3e62769f258d324. 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/2be91202-04e8-4e71-81d9-749c877f763c.json and https://artists.proofprofile.net/proofs/artist/2be91202-04e8-4e71-81d9-749c877f763c.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 0xcbd7c6e77e3b3a391e7baf5565377e0bbba0b2bf87c479a391e62f539614d89c. Chain 2 (Bitcoin): anchored in block 958678 (2026-07-19T05:59:57Z), 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/QZDA52075640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb08dcf07f01fe62f64b07b4d72d362342e61f78c9e4fafbd895812741e78911e. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/QZES92052110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9b5af78d8dac6a3875871321a395c203879a0ce6d3e2e34e60e6246aa7f6a28. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZHNA2027520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8716fc67b4a79ac5a6bc8ec1295c09eb324ed1cac409821753c19ca0e80c4165. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZK6N2005596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f81166464535f45cc13688bd3319cffb0cc6c5eb2ae3a3da2c7f06dae7ae4b4. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZK6G2057010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b51f21c11f79f988333341d4db094c35219de55d36ca1ddf6391b3ff979c698. 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/QZNWS2037070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8064c4af98ecdc96952be25bee473607958977c4ca96f2e21fe4d5e41b4cbc0. 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/QZFYZ2178919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21dbcbfd4cd03038fe6a1b1dddbf3070ace3ee1e0eaa00777fab8ec0d2c05dc6. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZES72185926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6077c4a9c021d9bcf252145faa8ff51395873fe4d6caf4d8c333f74242221fb6. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZHN62192207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x973d3f27455aa092f85ff0a271bd1c8777fb88f88771a1ebed7aa91f18a2adb0. 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/QZK6H2111799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90f9907d4e6c63987d647edb7bb657903f8bc9ffccac96703189937da7631fb4. 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/QZNWT2159408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe48adb303d97b765c5afa6478f523ef012d410b228c435ad12a8551a8c2e7513. 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/QZHNC2244909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddd14db816721aa05f8b334b1276c4a7426d7cc8401971e78d17b596765bfcd8. Chain 2 (Bitcoin): anchored in block 957583 (2026-07-11T15:53:17Z), 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/QZFZ32368808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee5c3f59976f2f6b4d63dae9330ea0f9a5001152e498fcca6bf5a22a9062412d. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZHN72315767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb373312ac3bd47180080c70221d6e39d822b7ba9bc68e6ba72f81ee8677d346. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZTAY2311822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b95e8189da396951070761f920792305b17d5838c79b0a6935f12573e45c17a. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZTAY2313493.