Left may refer to: Music Left (Hope of the States album), 2006 Left (Monkey House album), 2016 Left (Helmet album), 2023 "Left", a song by Nickelback from the album Curb, 1996 Direction Left (d
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 0x68544e8040d36bd417665031677adea6c61cc39d58b7e6aa496e0b4f03a7398b. 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/e7524db4-7086-4c3d-a711-fd2a1402bf65.json and https://artists.proofprofile.net/proofs/artist/e7524db4-7086-4c3d-a711-fd2a1402bf65.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 0x8331c3ac643a79b8937d70ca40c9ceb81354b3a91e0d259b37e33ed84108acfa. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/FIBOA2400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3dc464f2ed8ab2d90f39592a5343061852a1160f0b988ffe1605aaa171dde9f. 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/FIBOA2400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbb12fb0c24196678371e9d080e515fdf3a90e79de85f8caa00c05a6f5b6451b. 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/FIBOA2400024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x870a2ef874731beadff2d9ff68722db3ed585e0196d5ea14a7b7ea576c2da862. 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/FIBOA2400026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbb12fb0c24196678371e9d080e515fdf3a90e79de85f8caa00c05a6f5b6451b. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/FIBOA2400024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb004d596709e7213e1ca2496e6a2c34e8c851996509f5fcd6b41e5ee9bd50d22. 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/FIBOA2400031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12c5647242b6c1eb5d64112df8a2b317ad118229fb9e829d06bcc233bac54f7b. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/FIBOA2400032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8331c3ac643a79b8937d70ca40c9ceb81354b3a91e0d259b37e33ed84108acfa. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/FIBOA2400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab2edc809370e14209c2b743fd5f9b985fe13ec69c8e70fcc8948cad54f3c500. 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/FIBAR2500005.