Grin, grins, or GRIN may refer to: A facial expression, see smile Grin (Coroner album), 1993 Grin (band), a band formed by Nils Lofgren Grin (Grin album), 1971 "Grins" (song), a 2013 song by Cha
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 0x3ad4580cb848538c2593c3d8becc0fcf49c3386dbe9b541b40b501fa3ec9cf7d. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/df29bedd-8384-480b-a9c5-00a5602643ed.json and https://artists.proofprofile.net/proofs/artist/df29bedd-8384-480b-a9c5-00a5602643ed.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 0x42864681ba05623b75a221d5d1d4a4ee91b979afd6774380a420e3b910d086e2. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/USSM17000687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea9e033623fb6b022e249d549bcb2df494c0b9710b912cc4185db4fa1476346c. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/USSM17000686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe55c6aef78b0a10e1912fbbe4569dd799135aea709e1b4f08e16e496b1fad727. Chain 2 (Bitcoin): anchored in block 959009 (2026-07-21T13:14:47Z), 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/USSM10501786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18d86f10ae0e4e5b63d0fc241abab135d2f1b1da8e295e101ad60e18f1da7e8d. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/USSM17100215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9387360522ca39df5082e17e6f736614cd3e70f7b493e69b4bcd0435a7c70f1. 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/USSM17100218.
The Very Best Of GRIN Featuring Nils Lofgren
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a37863d3e3877ad7b530d6e436a182a13ff452308098645df23b99a7791a7ae. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBLFP2032629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14705f4b7ce10444cfd2c85483e595b6b7a97b524284bca7c4d4334c64ed4bf6. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QMA8B1400155.
Rock Artifacts, Vol. I (from the Vaults of Columbia and Epic Records)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18d86f10ae0e4e5b63d0fc241abab135d2f1b1da8e295e101ad60e18f1da7e8d. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/USSM17100215.