Tim Lefebvre (born February 4, 1968) is an American bass guitarist. Both as a session musician and band member, he has worked with a wide range of musicians, including David Bowie, The Black Crowes, E
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 0x79ab7e2ab19689ad40d946486b333b9bfc1146f053ef5d36c5ee8f9faafcb365. 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/5a6e233c-5e75-4188-91cd-c9e84fa2fec4.json and https://artists.proofprofile.net/proofs/artist/5a6e233c-5e75-4188-91cd-c9e84fa2fec4.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 0x4f6eb1aa66fd0a4b769fa8a2ba9ae8d9733ebe8104767e067634b584a4e119ca. 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/DEA891400072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x481ca400056d5d505fdb1c17f52ace7a38fd34592cf3a2be5b98d9097ba908d8. 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/DEA891400070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x578a98e60074d15ad5294bf3d3f477763fb4ea1ab21bfbf6d8f4f50231a0ecaa. 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/DEA891400071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda361666d7844bf9ea5c0d1a473bf13b3db46f15a1ea8f6107f3c0dc5a34b90a. 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/DEA891400074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9670d4f64a51ef3a006e5c67f31d019c89c3439cf557ec26243377b0437ef145. 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/DEA891400075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x262ec8d9cb1fd6b3cbf41ff86e8b285236d7dc9569bf90684474d468fed748d4. 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/DEA891400077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44a40f76537ab3a18c8e7dcec138acf33a922843a315f89f8e8afe335aa26f66. 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/DEA891400073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3acefe33293b5c583875e4dcff8c1a942dac02f5e1d6bf5c589b0c23560a2c5. 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/DEA891400076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0447bf38fa7e992bb1fdabb6c9e28c5f83a3d4040ffa21cb81b9130cea477bab. 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/DEA891400078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x644cf573f858c8b7b4afbbb60217aa16980df072a41d0bdf8483ec8758956836. 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/DEA891400079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5a8ad8fb7c5f6100e5ac72bc514f7b73824750020b4bf22a9b13836272af1b6. 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/DEA891400080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3843b2958eee9b17f48418df608b923cbd734fc72ac6ce9dba9172283cffd0a0. 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/DEA891400083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b609d79407099a71b6333124c375f7e90f24b1b257aa5ba75bdda22882ed1ad. 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/DEA891400081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fb5e9cf751c1beb7535da91cb40a076b254ea825f6b865000611c5506631e36. 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/DEA891400082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eb26a1ca7232ebac7dbca90cdf3f3d823eed349bf340dfb223445a2c813685d. 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/QZNJV2493604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74a0e227873fd068f976625a28e45f775be7f8d93f2012ee125bcf69190851cd. 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/DEA892200290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa22c98a33c1b16fa53a31d175c91f7ed9ceb3d542eee52ec39341967dcb9608b. 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/DEA892200291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cd14a43c426f506e39b2cc5f4a40b2f71ef64a39beae2666a7538d3f4688618. 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/DEA892200292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b1d9f21f1339a9899b79ca52174587ea32469c732696efd4176a9e86ebff9c0. 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/DEA892200293.