Heike Matthiesen (27 June 1964 – 22 December 2023) was a German classical guitarist who appeared internationally as a soloist and with ensembles. She promoted music by women composers and used social
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 0x441605ff877226dda2d34f3a0e734c35c0652cf10a3b8439043f982b39415847. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/224351da-ec53-4d5e-b66a-6c19d85f552e.json and https://artists.proofprofile.net/proofs/artist/224351da-ec53-4d5e-b66a-6c19d85f552e.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 0x9d2f01e8c323d043e11792e738b7aa435925a1d252f748074c2759b12d7eb74a. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/CHT539800130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x471a705eeeed1a5c27e90749cbd35950f619144bf0e5ddc06b57d1c81c7b9f4f. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-16T00:32:20Z), 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/CHT539800132.
Songs Without Words: Forgotten (Impromptu)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6069f9c35dfd4290cc2c33329e99b5c217f6f11d7710b3abaaab484a6a3a1974. 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/ATC481600802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6b3d920d929067b878e2ddb20c67f3eb439b613d57b5926ed8ffdcf8a4481b4. 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/ATC481600804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec99834785085b9980b7b4a4bf6744c877f6be71f02245b15d69e35c301f3813. 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/ATC481600823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4797a841eb8c564e73e953b153a8b3026a36614ccd98c3d3542253156bb4c70f. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/ATC481600808.
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 0x7fc29b54ebdf46b36cd58868f0a5710e4ff23b98d5fc4b1ead7a574e5bbd3b66. 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/ATC481600801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f07d4ea0926978505d3b27ffdbc58df93573d9f08ddd3052febca7b7a50c2e9. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/ATC481600814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb10d5941b93fdac2042e3c6ebc646e57b11bbf2c8c479405dc7b041df0471600. 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/ATC481600815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec84cc7b6ff4e037f9a94a6220b7a993dfd305c7da3182f3a14fc3098a7bcddc. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/ATC481600816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9f2d4f601b008ed144445221fd3d0af4ea82b686f8fe8d20cdf850f3a8d6294. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/ATC481600818.
Two Elegiac Pieces: Sospiro - Vals Triste
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc95f7f84ea460b1f2b7fc734e69abeaa442b8611da68536a2abea1e9ed71fa87. 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/ATC481600824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x250be4b2bd0cfb0cdd1c74eaa488b2c51439e30977cb61037a928ebdd2f48a8d. 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/ATC481600825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fb5507fd041fe3b51dd5f1907dd68e929c13d23874a69ec62238be77bf2dbd0. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/ATC481600826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccf08db775eacaa0afcb6e3b3514cab00ffa6e1bd57500d7761e23da2eea8096. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/DEFG22335553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2537cfedd688bfae207f5915b3261a158cc81aa6bbb9ebcd8a150d264cfe7e39. 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/CHT530100029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b3e36afd8a3e769183961936936c36002e4e098f86707521782112e0a4ec2b0. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/CHT530100028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd69b5268074dc2cb1ad9cf9459d575b306b1b008a25571eac2bd75a99e3a5d09. 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/CHT530100032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72d3c61c4141b05e80c9e5bb513d6461e9da7029d0f0f2551eb75c09c10b941c. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/CHT530100033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7db0c16c3c1704e3311ff594fa4aa933308abd6d3b25f8721e10f407e5d5626. 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/CHT530100034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fd6d6a1dc3286e42ac576a8468349c3cb9b5ecd016d00c1bc9c5e86900d183e. 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/CHT530100036.