Henry Threadgill (born February 15, 1944) is an American composer, saxophonist and flautist. He came to prominence in the 1970s leading ensembles rooted in jazz but with unusual instrumentation and of
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 0x1ee482fd5fb2cf6b82daf74048dbdab8f65f487281d4e7cf2e34e0a777724397. Chain 2 (Bitcoin): anchored in block 953733 (2026-06-15T03:12:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/962b82e1-1548-4a07-be7b-1da6b2db72cb.json and https://artists.proofprofile.net/proofs/artist/962b82e1-1548-4a07-be7b-1da6b2db72cb.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 0x020f70f52e3e3bdc643128729b9471ecbe9ec686f269c6eed98073f47658f839. 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/US4S41800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a0c1bebeab98af00f7c35a986210eaebd5ba8caa7cfb7e9c675c791794762d0. 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/US4S41800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf80b826c95860575725d93fc9ab71287272c2ed3a3a7f3e20aadf8400be8d82d. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/US4S41800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d2c4266b2660fa53a79a5befad78c4db9e0f187610b3efeab71510042ed2f96. 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/US4S41800004.
In for a penny, in for a pound (opening)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10406dd7efad79d0459f57adb7520fd5d85cd0ec5c717ad3b226487c375a594b. 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/US4S41500011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdabaa0bab6c6033756246f430dbbedb675fefc9cb123cdc850181b1db1e383ae. 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/US4S41500014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09e518694bb1944ca6f3bf79d278a846401a6e101c740a950476a0c7aeb4bfe2. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/US4S41500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0af9812ac659561c0452077af5653c766d53ac97c269515e3c59596a275d16d. 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/US4S41500015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc263789d81e1240d7bac9b56f87af7f8c52a2a31f06d2c13b08afefb247e1cc. 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/US4S41500013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50a01f81c219c545ad2effe55cc1ccd2fe17d8c179e2fbaf560b1bbf4c052b1c. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USAR11000169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc283d632ae7642fb161aa6be6deb5d607834f6a3d64994676e3d92d4ab919fd. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/USAR11000170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae429aabd2d8caccfeef90b1b6fd3a7b5c9bade0a1b9434d3e99235cf2b01e39. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/US4S40210028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd07196c54f71cdbe7fb7da4ce683bccf99e7f603a37f25f44c81ff5742259049. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/US4S40210029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb07f7453514a060c9842cca8d1e834cdcccee0a968f6a2888f770b65d926dd78. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/US4S40210032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6a22aa69935efb50e337777257a845344a709df1f9f3fb535c834ee5af7002. 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/USSM19500427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5150911dff845d492b2d213e92ce90a03096fd52c6f1639267937cad734a0f88. 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/USSM19500428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f1a79309104a0640b1317f170896c4f1afaca33e3d7f4bc7bb05e44cb8f17a. 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/USSM19500429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb327dd183085a0024b169f4e2843f8bd0a7d70f93b1cafb92f125183f0073b69. 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/USSM10211043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67af2fc7e59bfc5e633f148f27465c432167f5f6354261c4f282335cd1bf5c5f. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/ITC000850947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4e32b96da1a8fad19859271eeb9ac25305c4334f83aaa49f725935ac33886c2. 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/USNO10400015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d374cf1b7e5e19adb8c1c9e240025e4bcfc9528a7064a33ab637ae60e830876. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/USNO10400016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12805da85dae83bae63c8577cd703f1b471efd1d52ec1cc25c3f728420d4053f. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/USNO10400017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1f8a53da21291c5504c2c95a13661435cc3d7342af14f2998e4ff3612b019e4. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/USAR11000189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c1ae2d21a1cf171bbfa1f903cda67b74f5c0bc371b519f9177f4230f06d7a03. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/USNO10400019.
Hall (Dedicated to Muhal Richard Abrams)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d62c7629e893a5f6fac6c7979c8e248d06c67ae9eecd0bdddb2f8ca0f01c32e. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/USAR11000190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d28a58318089140ae59847d02807e717181718795811bf1423fa0f51b0ab48a. 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/USNO10400021.
Clear and Distinct (Georgia-Anne Muldrow Remix)