thumb|Cadotsch performing in 2011 Lucia Cadotsch Lucia Cadotsch (born 23 February 1984 in Zurich) is a Swiss vocalist, songwriter and composer based in Berlin. She is active in jazz and improvised mu
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 0x354611147651a04356e9f32efa2cfb558377af685d77e540dee891870383b4df. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c5dae61f-1d00-4112-8b91-a1ca74b70308.json and https://artists.proofprofile.net/proofs/artist/c5dae61f-1d00-4112-8b91-a1ca74b70308.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 0xdea1fb5ca54aea5f956e75d5308c1b341f77d7bb0bd42bfd770e0ae187a67c3e. 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/DEAM81600005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82423460b5eb947cd69cb68d0270e6a7b649bf8da239c578562823577fc40801. 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/FIWJZ2000083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e82b758547cd820410e57c9fb225b8897c4d184d27a816e832bf66e999df273. 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/FIWJZ2000084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22cdf0fa10c0221d7678472bfcbe516cb5052c0ce055d7a4fe1abb92938a7bcc. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/FIWJZ2000085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f67556bdce3e576cd0cfef85e50f7025e4653ff8feb7a9dae5e40fce3dc2e23. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/FIWJZ2000086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e4b4db78ef08b32057df6946a0e07e4e541130a9ff48e904b62c537a9b22371. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/FIWJZ2000087.
Black Is the Color of My True Love's Hair
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a2c9537ee0c0eafa0bbdf2e73d437e75e541506a8f12034a796664695cadf8b. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/FIWJZ2000088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1729fd4caa35aae87d7d252e06fce81bd35c0bbb62be40940f761ad5695682f5. 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/FIWJZ2000089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80887da5e84f8a9fbcf8bc48ac586f25161e1d497451235e72f78bf80ff062ae. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/FIWJZ2000090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86e68db072809c565739e243625a794e226ad825a014b66bc8e40c35b75f026e. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/FIWJZ2000091.
BITTER LONG LYING LEISURE (feat. Kurt Rosenwinkel)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa59504e549d74f75ce80289df38e24da86905805a8e06682bb997dd7345f1ba8. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/DEAM81900106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c04da8c23484b06c91f71a1395210317b7fbcf744e96c6944446162b567f961. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/DEAM81900107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53508e057cac2edb845aa6e6acca2850091251f313788702761b3709859b5206. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/DEAM81900109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b831a5c3f036addb4675baa0bf3c7b9ceb20534aa7067c91db110e39f193b02. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/DEAM81900110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafcf97dbd2ff72f36ae08cc7139327e4215376533fb5eb71d102650040833ab5. 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/DEAM81900111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e3fe9e4d916b460313dbbc67f449ea0fa9421d934d4b8a27c2a87e5a909d15b. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/DEAM81900112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d44166dbb3f53d0e277e994f424ea9152eaad7490c997127b34801816424345. 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/DEAM81900113.