Exp or EXP may stand for: Exponential function, in mathematics Expiry date of organic compounds like food or medicines Experience points, in role-playing games EXPTIME, a complexity class in comp
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 0x09dff827ccbe696a9fa58987fc98ffed12fa4827f2052e3e8d763136ebe430eb. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3ebc5c33-2b01-44fa-85c2-99ddf5b7db3a.json and https://artists.proofprofile.net/proofs/artist/3ebc5c33-2b01-44fa-85c2-99ddf5b7db3a.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 0x5fc96e607801636f95016a1d28af233b7f96413984139f647e68ef12486bf147. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/QZTAZ2206262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x540440daf76d17b6ede2c0c35bdd3c921390dc08472cba332897865aeb3f8d9e. 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/QZK6K2301323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb94b7a3ca46a09499d2adf31f81a62478e0f80a8b198dff0617e9748c40e321. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QZDA62597321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd06d69adea82d19be50c369b38aaab28e40dd8e893b38d1e52a00dfb130aaade. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T02:09:05Z), 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/QZWFQ2449679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2d90155b63363cc0c7e7a5ef27553bf92bdca131bae0eaf3ca93e66d8fbd822. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/QZHNC2557193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3688fd398e1776c74ef8006b01345a7ffd1f741732bbb1fc9319aeae69a2eb45. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T06:51:49Z), 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/QT3EY2507902.