thumb|Soil and water being splashed by a raindrop Petrichor ( ) is the earthy scent produced when rain falls on dry soil. The word was coined in 1964 by scientists Isabel Joy Bear and Richard Grenfe
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 0xf4d6414e9d32ab738dbaeef89fb9d49598fa8d057a9d162d473595206b8d8248. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/df804031-236e-46ab-acd3-b8f67f743560.json and https://artists.proofprofile.net/proofs/artist/df804031-236e-46ab-acd3-b8f67f743560.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 0x8b60f99a1146ae6220f8caf95297c899835ffc9b2836aa77c2dbf2ba1079b1f9. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/USL4Q2569864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa437381e2a2fecb5ed241a82bfde7f5623b6ed383355cf046629ef4c575eda8a. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USL4Q2569865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c0f3ae0565f5e39524480266ff61f772ee015bca4ff82708d1383c28d246b3b. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-17T00:24:31Z), 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/USL4Q2569866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x896a008b7da272eb467a87b1bb11c8873f50a4dfc44aa110fdc6e83c45df9224. 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/USL4Q2569867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e3cc37308b320c8772adc2d604c9bccea8568c784ef832752cac07c69ab2059. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/USL4Q2569868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d24fdf443689246a510c7fc504387a180a3a44d57b6e8b102313b4cea5a90f1. Chain 2 (Bitcoin): anchored in block 958303 (2026-07-16T16:39:24Z), 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/USL4Q2569869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ad96e683e74fd9e2e23a36a66e606f790a8bd94b4d96e92fdecb6a8a3782c5c. 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/USL4Q2569870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfea7349c82b015d910e515fd1b4c11cc685071dfcc159f35d9a59f6c57991841. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/USL4Q2569871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba87bef3687741bac7da0dac05d1bb9d1abbb2b03ef93d7411337f99eee62b2c. 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/USL4Q2569872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33198f7025469a80783439bc34408af181a6ab4dc7c9dcd2efad9073d49de020. 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/USL4Q2569873.