Sweet Crude is a documentary film about Nigeria's oil-rich Niger Delta directed by Sandy Cioffi. The film premiered in April 2009 at the Full Frame Documentary Film Festival and has since screened at
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 0xb2c10838dfd541c7108ed2a13128b8de096a29c0a2f8e9cccc1844a42149b9ff. Chain 2 (Bitcoin): anchored in block 953596 (2026-06-14T06:21:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0ad2078c-2a3e-4445-aee2-7426e9d37a86.json and https://artists.proofprofile.net/proofs/artist/0ad2078c-2a3e-4445-aee2-7426e9d37a86.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 0x344c7887c3262bb22bca83565148310017ccb78f6573b808334644b8533c7e99. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/US3JQ1300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b91a0b62439258eb764fa4c088c39d69675f528a0888ff641f887b87773b60d. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZ4B61600037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94c18a68d303e8d28dd8c5fe135cb9976b731fb3af60f05c6089f4563cffddd1. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T19:59:44Z), 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/QZ4B61600039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68755381354f5960ba976788b7156057e937d94deda2b106155bf85030c8315c. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/USUM72000777.
Sweet Crude - Jam in the Van (Live Sessions, New Orleans, LA 2022)