Steven Feifke (born June 21, 1991) is an American jazz pianist, composer, orchestrator, and arranger. In 2023, Feifke became the youngest musician to win The Grammy Award for Best Large Jazz Ensemble
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 0x978b32e71f5ed71502c201a2e1402fbb4a4870f0361fa31ed3381649a36fd62d. 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/e4b59341-1e48-41f2-8231-f2f119f2d830.json and https://artists.proofprofile.net/proofs/artist/e4b59341-1e48-41f2-8231-f2f119f2d830.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 0x03d11f6f7769deeb53c42449326c6215fec6ed36ed6108f9c125936cca26a1d6. 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/QM3JE2101867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe86d9d2906fe0a5fae091fb0eeb06a06c2e5c672e469bb2ee5c5e29b14c102c3. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QM3JE2101868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f29d6ea5cfc09d9a3e0be45abeddd137f803b0c1af014e126488d93b9a8f0b6. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QM3JE2101869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75aeebe432f20b4bfc32c6513f8de136360fd316fd75fda3c39b5f4fb4ef1746. 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/QM3JE2101870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd2f10a46a38d28c6624c4cc2390e31bfb0ae5cc1857a5dd3c393b941dd76d1b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QM3JE2101871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35d46f0c217e7e8a02115222da8de8e2ddfc86714eee409f652e4b2ddcbd26a2. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QM3JE2101872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09d6a5e896b0695c39ec791b57150b4a61399b3b3438d4d0b518ccc4aa73adba. 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/QM3JE2101873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x319fbb3f6d09873d845b2509fcc6eb32e04b30237adae149e51e13d3420d2dad. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QM3JE2101874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd229685fdd2011e644fd7c892463ca9cf112cc5ea98cc46fb98c55eb8e0e8b6c. 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/QM3JE2101875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe60f31d6502a134441c718586196f4fdf8eed97f086fed9befc4995177ac2d20. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QM3JE2101876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb12e4e03b48ed4780f471b80467851f731bb90643a8640f764ec6fd8c034f022. 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/QM6N22143963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x159f3a2254f17eb9b94444dde8428818d436cd0fa7f378402e6bbec1ad1a1b77. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QM6N22143964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe196b5dc52f9ef80782c160eec28d97bdaa000be1fc1aff181f2874d7cc810ee. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QM6N22143960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb12e4e03b48ed4780f471b80467851f731bb90643a8640f764ec6fd8c034f022. 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/QM6N22143963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x159f3a2254f17eb9b94444dde8428818d436cd0fa7f378402e6bbec1ad1a1b77. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QM6N22143964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12d7e4ce0ce4e67070fe85fe3b43acf3ec470f6a07f1d7acce485e4256f1a2a4. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QM6N22143965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb75f7813ba674cfe18359947fbc0c15b6503ab9c2a4b6b88e31c1cac7db0e2e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QM6N22143966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ca5ad4d58b66577faac9ba07b0150a637492c8123c0ed1a7a399f9fac492471. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QM4TW2216713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x758c1b436ce59b50a6d8496a4b5462ffdd097d209afc9ee8be439692d61475fa. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/CACK42202703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6335ee7fe255bb0afaa5ea96e9df57c6def9cb69cfdd7e21ec81eea127bc4bfe. 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/QM4TW2312106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2b6b598729220dc573a6515eece5df1a7c6d8a8576063641cf2b376e33c303d. 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/QM4TW2312107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39ce991b39d95c92dd80bc087195b8a6e204f18484177a5f290e0ce47473f520. 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/QM4TW2312108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fa30460c38b5b222cce5aeef46a35be590321442e32028e3ccc500e90687035. 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/QM4TW2312109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf8285e61be3627bd9a74bb6a29e4ced6b1029198d4356067b421f0ede754782. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QM4TW2312110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18d1fb378e11050cc562f6ecc374f11fb5bc88c9737a3c3f3df61e217f620e3d. 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/QM4TW2312111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2e651fac8ef161cc0611f112daf95c6039d1f7a961d444ede1f9369b409dd40. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QM4TW2312112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dfa4c3d5e41c74505bcd0bc625b97f614e2186ecc85e15f727cd572304abc1d. 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/QM4TW2312113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea263b7619c225cf5f9fe0dbe79efdcb6e1e440e487bf071af4656e19c955332. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QM4TW2312114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f2dd7990726680a997241fe903d610aebec244ccc60f42f33330a6a50a27a80. 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/QM4TW2312115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c03d1df32658194bc05d00c72110d04bbd6794c4ca4c9a21dc70fa9aea6d58f. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QM6P42539475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e97f20e08126966a9f77fb0dbb080bb13a2c07c1e60641485f6c97f8dc00174. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QM9Z92000052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5236f2a74ef57212cc3d32fe2ceba1f0bdcbfa415587cddc1ae65903aabf4d9. 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/QM9Z92000053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33f0083c52e6e22187e3949efda08e9db48c69910dfb9470d5f3922491611363. 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/QM9Z92000054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5398b950413e26813bb9f35d7f34101187c8cff12d47d86e7871a1fbacff6c2a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QM9Z92000055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8fbfa2636fec92ba9ca87b697e586a1dd9e61ae23e26823dc7b79d430deaafe. 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/QM9Z92000056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf67e6381a666b053d63214dbc634899457c1e11cc2d7311f6cfff6054144d894. 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/QM9Z92000057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb096d5115872b8a499d4bccc55b91cb202e843b0dbf22cfdc90bc3791f2729c. 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/QM9Z92000058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd90da5da8df938c8939dcf309a1c58c2cd9cc954a2d3decb1e2b3f000f7712c3. 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/QM9Z92000059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x764d03c5ccdcfa90db39af447302b8d07a705cfcf6ceb51e5bba3abecfc4c495. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/QM9Z92000060.