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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4a6ab39af36157b50fcd5bb298ad2e768f066bc78ff6002d9838d8f3698aafa. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cff98e5f-e86c-4ed5-a17f-78cd22f9b934.json and https://artists.proofprofile.net/proofs/artist/cff98e5f-e86c-4ed5-a17f-78cd22f9b934.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x560084726d62805b6e180ea68a5eecf7dc17ef52322339283389f635c0f401f8. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/QZNWS2107301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9090c1998e92e26a13fdf3cd47db95ca1c4c6c25262a9bbb33410352db831859. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QZK6G2128970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf80337dfa95e4085534361a6be1bbfb72276bd8e79790596ff624b235db9f09b. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T12:00:06Z), 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/QZK6M2100190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x784967fa5c7a9a8ead703caf45e0c6332bd5269fb3024286bf883b37de0a563b. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T12:43:32Z), 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/QZK6F2243215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02b7e923877fa684bfef7b9ac6b037b25405120b7e8f16ff48d9c3a231f74314. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/QZHNC2345909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x167a5f802501406d769374200bb2302cd9dbecf61a4edc73dd2165f60db43bb3. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/CAPJB2417003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7291cecf61293bbe35ef272e143333b1876d26de1a8901ebc14a617a0f674e78. 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/CAPJB2417002.