Gwendolyn Guthrie (July 9, 1950 – February 3, 1999) was an American singer-songwriter and pianist who also sang backing vocals for Aretha Franklin, Billy Joel, Stevie Wonder, Peter Tosh, The Limit an
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 0x3c73e0d1cff257050fe8e1c9746c38cb262e3c9432cdfdf1d360cc99693be6ec. 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/de9978d9-b5af-46a1-b37d-8dfc41fa42d6.json and https://artists.proofprofile.net/proofs/artist/de9978d9-b5af-46a1-b37d-8dfc41fa42d6.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 0xe57f1ad735fc1b685441eeecc73d46d92c4a86e0a11d6eab55158973202e4aff. 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/GBUM70712790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1a357a4cae9be370c0a0255eead3edcfcb6d8b560f44012afa47d4c11616db3. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/GBUM70712794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a40c2c5656a9f90fce1c72b68b7b4b82ff9b533f24b519b7dd023e58a2f58e2. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/USWWW0202966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa320e728994bc661c600f2d89ecfaa649c29c63682489b0bfdd5a3ec05a773db. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:43:57Z), 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/USWWW0201103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc589f685178a884df6cf0b0dd1ba1c6bbecf135453b505c5f1c348e6307c5c68. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T17:22:52Z), 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/USF068625010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f166bedae0e3d51948a80eef08763fd184818e31cd6061fd160b30a217ace65. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/USF068625020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c761d04d166f0343a410291e581e3a6c8ebe2afbd3a0e5718c49eb829a0f074. 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/USRE10800446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf30719290627c01ded85d0d5faf63e1287c067a192f899cdf5ebc87840517fa9. 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/USRE10800447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x442d89df7c31443f1e83387dc97ae2a7da43af057236a166f44e8966c4adce54. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T16:09:11Z), 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/USPR39982227.
Ain't Nothin' Goin' On But The Rent - 12" Club Mix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d3a5bbc7e2fd34ccc688ceced213cd61ef7cb5bb86411304b2955831e78fbd2. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USIR20200475.
Nothing But Love - Long Version; 2002 Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70d21963c277283e2d13fa12368ef45ac6586e0ae45492bd7de0821f013c3b1e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GB01A0200037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffb1bdc22d379b38bc39231c2157f45128efda6dec46e1758923c0db47a058d7. 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/USF068625830.