Echo Collective are a Brussels-based orchestral ensemble, founded by Neil Leiter and Margaret Hermant, working in the post-classical world. Echo Collective make interpretations of genres as diverse as
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 0x8361419471b327eb63a6737675eec5b1c0adfb0d47f7feab880f3093767b7a75. 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/cf93dde2-f2ab-44b6-b35c-6a42ac5af02e.json and https://artists.proofprofile.net/proofs/artist/cf93dde2-f2ab-44b6-b35c-6a42ac5af02e.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 0x4c5476b753cad60289c486abf1befc50decece0534b9255f9cddc72af673a5e9. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/DEG931701283.
Packt Like Sardines in a Crushed Tin Box
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x098fc77544de2059a0c38cffab045d56ff3dc20e861d5a0cad36007eeb0e0df3. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/DEG931701280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72c46b725cf0fb1ac177927835c09a78fe4e5dba144f98ffcd86dd7a5e0ced55. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/DEG931701282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d98beea0af55fdfa7c1bb835f5704144854592c7bc282d6be13e6dcc7962108. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/DEG931701284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2dcdd7e2508967586ab335bf7933bce1f86e5b2e6a288fc0db86d4b8679fe34. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:22:12Z), 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/DEG931701285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74b05a178283d543aca76d1618e5f35724520e549620a726cd86e3e424556b99. 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/DEG931701288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06c4d5e321cd2e6c8c83edc56bd2c887f706e29733b353be16096009ea6a3d8a. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T19:36:38Z), 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/DGA0Q2339149.
Jóhannsson: 12 Conversations with Thilo Heinzmann
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb69078ee165da54bed7c291929d60c8f512aba102adb448e1ffbb35c5910ad0c. 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/DEN961930001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eaa5c8ed352ab750768e08f0c40461e882f9ef2e72e2661298bedf842eb43a2. 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/DEN961930002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd56f66a83ad4223df3f73b8798aaeefcdef228b3aa804a3559f5f4b45a0988c6. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEN961930003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb19f6f5e1ade1d8b4e65cdb1dba2cf5cf8ced032ebfed83913d6afa55dbf7753. 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/DEN961930004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb75bd99457b50339152a7fb7c0f388a690990d67efb642d687c0c6c7e05e59aa. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEN961930005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd2bcecb517fdc68276a423e974c18b913fc886abb0265aac392fff0f939f9f1. 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/DEN961930006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x585007c78e2b3950cc8d1f8ab0f89e30f9cb46c20965d9062804659f01dab4d6. 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/DEN961930007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdb655624adcdcf3dd831d83be4342a8975412a58f4ea4a74870cb736c2aba31. 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/DEN961930008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30de24f5b5676718008c191cd50b6f384a25fb2de30f06d090e229dc0ae15100. 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/DEN961930009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15fc37f0e7ec3836fdfa047ddbc0eb63088d41e318883a9053fa7ee2c5bb9bdd. 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/DEN961930011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa063bbb96faea9c52e9e3e8aa5c0b8c8c0871d8cc1682a4aa19238273f9386c6. 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/DEN961930012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb75bd99457b50339152a7fb7c0f388a690990d67efb642d687c0c6c7e05e59aa. 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/DEN961930005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd56f66a83ad4223df3f73b8798aaeefcdef228b3aa804a3559f5f4b45a0988c6. 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/DEN961930003.
Musik zum Entspannen - Klassik zum Träumen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bfccc4274ecd46ce0db39fdc221cab2cee0540900491581720f0625b94486d8. 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/USQX91801010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x180787d66755de01e213ab7da4e33ddd64af7394b462ed9ecbf5d55d8567351c. 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/DEN961930010.
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 0x79057e422975e8ef9e039df1b7a47656e7b303afad2d67e7520e2b5de489835e. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/DEG931910968.