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 0x32d860f4b1fb351496de25e33573f03467e7a0fb9a0398ff01b7d03a6109d411. 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/dc6f92a7-2d0f-4386-a717-37cd90690902.json and https://artists.proofprofile.net/proofs/artist/dc6f92a7-2d0f-4386-a717-37cd90690902.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 0x888b648d6afa8c79c1020fa048d2cdcc296e07d1ef70b7ab3c8e0814a7a343f9. 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/TR0061900035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9cfc1b484f399c0f7a98c4d6de8833822712eb8eb31efdd878b5ce6bc0145f1. 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/TR0061900037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbade9a7ca914a07ec5861fec1234f3f0e05f683a1981fc7886d80bdf3fda91b3. Chain 2 (Bitcoin): anchored in block 957552 (2026-07-11T10:04:42Z), 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/TR0061900041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62ae9c55201d441f30b31bb032dccaa310b3f44be3dbf83000b8dc5b297eed5a. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T22:04:25Z), 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/TR0061900197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32216bde242a599e2e12c56650ea399a688e45a95ad2394d2ea840313cfcfafc. 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/TR0061900199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe63f606f71bfaf259159193ee7abf998d11ff5618384f829ac6cd81c23347712. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/TR0061900200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5657077e02b5799d180d0fe088a9e3e91a0b9f44242c43a996a5c05601186440. 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/TR8002100038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3a423a2590d665df798e1c7aca2b9b18a9435195e40778540fd2fc66967baec. Chain 2 (Bitcoin): anchored in block 957834 (2026-07-13T09:42:16Z), 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/TR8002200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf08ceed910395d65a62d9c5b53cb713a53910d613b081bf92a2cff617bc2e14a. 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/FRX282221483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4e1f68e0d7f72985cd2dbaecffecada628ff10bcecf08c10f9f634d444efdb9. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FRX872285415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x258418e81ba36c9597eb61b214cc997bc51bea8e08e7685a055f1f94284eba02. 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/QM6N22308911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0043afca79225a8b2899b11a153446d892fbb781e37bd38890191bb695c01e0c. 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/QM4TW2412705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18a2f28a3733bb33dfc25de0c6d06a8bb8ff6482235c7ed21cb65464df8a6840. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-27T14:02:08Z), 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/DGA072413393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f00a5e64772b391cc5d032280052d211b1054cec863838adc9f19bee030c668. 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/DGA072413395.