Rachel Carmel Hakim (née Nicolazzo), better known as Rachel Z, is an American jazz and rock pianist and keyboardist. She has recorded 13 albums as a leader and jazz musician. Her musical style, especi
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 0xbd082c76e2222dd4e1876271e019c21563724d6c0c73639fc0bce9ccc1902906. Chain 2 (Bitcoin): anchored in block 953808 (2026-06-15T16:45:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f0102fce-d6ec-430d-9b5c-eaccadc0c365.json and https://artists.proofprofile.net/proofs/artist/f0102fce-d6ec-430d-9b5c-eaccadc0c365.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 0x6819f96d7fe96a56792ab3ef3ecc242c6831185895d756058e3bc97e455aded8. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/USVUS2314812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdae6db2fbc27d57f6e8376fb9d3d060feae045086d762422cecc7e1afcf9620. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/USVUS2314810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6819f96d7fe96a56792ab3ef3ecc242c6831185895d756058e3bc97e455aded8. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/USVUS2314812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36ca225c3a28a65d636b7cf333837f43728da33d1e42cf91beca6af3019ed34e. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T21:17:32Z), 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/USVUS2314813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f4a50b12b9c338df59971039e21521915efe42133b56de00823316bb68d46b5. 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/USEZT0610179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1faebd045652b14dec2779b9d208b5ce02529cfd49992fe45b6239a19b8cd2ed. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/USEZT0610239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb1f47779319a985b72d147a4069af33a30f31fad707c3e28ec353baab8f3524. 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/USEZT0610240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cf953aec54a8a1d40cc99f3771dba5ea922909ccfd80503888e7866dc7cee2e. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USEZT0610241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22fa9fc33338ce744a785a977a35f33fc9b3912cc215ddec35e227f81e7ddeda. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/USEZT0610242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99ddde85b52787f218e8b001fe54a0de279e44beca545389650ff21e95cccc3c. 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/USEZT0610244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4514177107a0345e32e3004ba47e08b45578c8549a25a7ae5245b5eeb187f5c5. 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/USEZT0610246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x045b397c3e220d416643e96d89357bc4546ec57ba5a11753455be83854027ccd. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/USEZT0610247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe286d862550023dea341cfddf41c29adc63219a47f8d72f389308c5cff0ceff1. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/USEZT0610243.
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 0x0acc6a6ae49742decedf597d7f06703cb893371cb7977346610fb94e50ec0256. 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/USEZT0610176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dccd4f1ce9044835fb123246d5e71b7d4cfbf39f6595f1b642f54b22cf5530b. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/USEZT0610182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ef402ee92e5141b75f82c9f342e339d0fdcaae5e9f00c0506396bb58224841c. 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/USEZT0610184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcce4dcef72c9713753a849288c24c107580400fdad6b00d72a9735e3f28ef146. 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/USEZT0610245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f606ef4eb7afeadc17f5155b10b4a146fe691115bb0e9b6bd1e4ab242fbe6ef. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/USEZT0610248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x752e64a77b170d5ef28606370e2105ffa3ec35351c04c0b45ff376fe8b5241bf. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/USEZT0610249.