Impromp2 were an smooth jazz and hip-hop duo active from 1995 to 2009. History The duo was founded in 1995 and consisted of trumpeter Johnny Britt and rapper Sean Thomas. They were signed to MoJazz
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 0x4b76217a476cfa60b7c0343e16f867f3b088b0a352b6f1f4db0ce4d8a52ff0be. 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/b1337220-ebe7-461d-b553-7048e1071d5f.json and https://artists.proofprofile.net/proofs/artist/b1337220-ebe7-461d-b553-7048e1071d5f.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 0x81bed8c3447a810215717cfa5664e9af7a16f697775c47a9eb53a27e10858215. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USMO19700025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bebc4ee6356964f993808c074ba059ae706200fa1e2b49d4a28ee1fad317c5f. 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/USMO19700027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc380f693fb66b30d39f2596938893150109a61b362a7c955a413299bd6b19a6b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USWWW0201929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a7486b3a775bdd1dd2788e9719a135ee7391e3badd73933600750e32eb108e4. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-22T01:03:40Z), 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/USWWW0201931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa942f2d3fcfc35162a536a60a59d33681fefd704e39c11d2ffc3c66a3b5c120a. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/USWWW0201932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5357322ad60152b267f0868ad96eb4c80cef6aad5ba4c6e29844e6c8131e0a30. 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/USWWW0201933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fcc82d58ce65498142987a9eeda136238a2e96ef7961321e2ac7c5a90c67dec. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USWWW0201934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe99f23dc7d7a2072d5030083a88bb1a580de64bf99ac5bb23baa7f7d07a1dbe2. 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/USWWW0201936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x310751572c8483d3aba22317528f4374dc82d03c089c839780e237a7120c2981. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/USMO19700038.
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 0xfc387720558f3154bc31a0d839336a812d5dcd57045ca5e1b9262faad10746a2. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USWWW0201930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef6d0fdede17734fcf5a93ec1064cc356683a0f6503da1058449cfb30fe63cc5. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/USWWW0201935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5f5e72d7a14150f1f5aab563dad0712a79f3592336d5265e74997dbb86b16bb. 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/USMO19500690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fd1f3e8adbaffe204b4b570e21953f9d73324345f0f630a13e97abdb8034c78. 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/USMO19500691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27af8baa21c6c991a40d29be5607dd22ca81cdc9ca849788aa9ec09dfc348b52. 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/USMO19500692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6c4446b5305285e6841efcae4f2c8446fe778e2ce3e0a0d5470e6cd7d2d42e9. 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/USMO19500693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc767e789d762dcacedd1bb9f50c5f288d5afb1011b452786792c76937de4658. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USMO19500694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e855b6adfebedf00d74c67431b71234a9255ccd2a69b3e883b6cc09a31a45c5. 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/USMO19500695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x416dc7beefcd1dfe68f6bb49922e291d746abf215e3da6fa95341f9bc54fed96. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/USMO19500696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96ff69c9e07889abcc90a341578821c05df8a74931db607442a77c8b423d08f9. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/USMO19500697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x028e0a1503965f0c73e447606ab4ddb06ab87a2d9d995c17e85ab499a4eb5a07. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/USMO19500698.