Christa Päffgen (; 16 October 1938 – 18 July 1988), known by her stage name Nico, was a German singer, songwriter, actress and model. Nico had roles in films including Federico Fellini's La Dolce Vi
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 0x540f1f81e1892c249b963f4b795752b389b9544241d93f18039de5b44022f75b. 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/63f71e69-729e-46c7-9916-b27886ff7681.json and https://artists.proofprofile.net/proofs/artist/63f71e69-729e-46c7-9916-b27886ff7681.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 0x43d8d35711880f0c702fe42e094428ada0f1db935d9fcd834ce3eef4a2e4e86e. 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/USCWY2100369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcef58b376e76ff68307db557d05713994d6d1b55464986fbc67f18f5074b9188. 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/USCWY2100370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc115057d776a7e2cb17f7816f09d8036253d7aaab6ba24ea871643be813d89c1. 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/USCWY2100374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5004a3db18238a8977922fbe17135f2388f0571d985a08f49abafe7906c309e6. 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/USCWY2100377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57445bd6500a4ac133dd5ad9c8d89561e51c01e4734221ce09b14be3fbb886fe. 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/USF096625390.
The Velvet Underground & Nico 45th Anniversary (Deluxe Edition)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf9eee1a059aab460e73d58c098a4d1c8a0e5e7535c71e700211323f5cf2768d. 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/USPR36702759.
I'm Waiting For The Man - Album Version (Stereo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x132aaa06ef97db19fcd71db52b7fec5a2ad984348cc15e68906f0697ab85b6f4. 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/USPR36702760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82fd6b0a02881fe67e918a55dc786e131e122c7bbb20fd58a88f91dd4f6c1ee0. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USPR36702761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7474823e1ad7ed294807570707c351a02d551e68fb3d1374769b2d77d458101a. 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/USPR36702762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d095224f34ce26be412e9817286076c028a3505741c93225423f0c1b6f9d4b0. 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/USPR36702765.
The Velvet Underground & Nico 45th Anniversary
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf9eee1a059aab460e73d58c098a4d1c8a0e5e7535c71e700211323f5cf2768d. 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/USPR36702759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x132aaa06ef97db19fcd71db52b7fec5a2ad984348cc15e68906f0697ab85b6f4. 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/USPR36702760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82fd6b0a02881fe67e918a55dc786e131e122c7bbb20fd58a88f91dd4f6c1ee0. 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/USPR36702761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7474823e1ad7ed294807570707c351a02d551e68fb3d1374769b2d77d458101a. 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/USPR36702762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d095224f34ce26be412e9817286076c028a3505741c93225423f0c1b6f9d4b0. 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/USPR36702765.
The Velvet Underground & Nico (45th Anniversary / Super Deluxe Edition)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x132aaa06ef97db19fcd71db52b7fec5a2ad984348cc15e68906f0697ab85b6f4. 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/USPR36702760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57445bd6500a4ac133dd5ad9c8d89561e51c01e4734221ce09b14be3fbb886fe. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USF096625390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82fd6b0a02881fe67e918a55dc786e131e122c7bbb20fd58a88f91dd4f6c1ee0. 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/USPR36702761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7474823e1ad7ed294807570707c351a02d551e68fb3d1374769b2d77d458101a. 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/USPR36702762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x713bd82c9fdc0aced410adfb208a44e3e1255089edfdd5305e0d16bc3675a8a1. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBAWA6573279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd974abbb2ae9ade20af7c468199d99cacc4d4afcb755c59a2acd953a08c7f7da. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBCEL2303237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e5c0626b87571ebd2ad36e42da3969e91c5db2a4a5ffc12c4058f10c6db3f55. 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/GBCEL2303238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08f90846f62d9a464b703542a386a9ab09075f5bbacfd0d2aff0079682bdb99d. 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/GBCEL2303239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47df1d538220271fb6f7f09399d90321a96471cc945e2c78c95f6f02fbb44de2. 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/GBCEL2303240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x721157eb0ee48db89b19d6a6d07e7953d03898b637f18ec612bc356502aa48e6. 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/GBCEL2303241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c6c78609298cdb905a4b61261756cf81bf665d82070f2799707ba432764a3c8. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBCEL2303242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5965707c8786ad6355530479a1879958d83c071e4405f33c84c7a501f5f4b008. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/GBCEL2303243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48926cff6803aa1cd5669d456d872641bd57ff3bf865a00cbed8e432e4f31b4f. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBCEL2303244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd90a798a5b35a4e165807222b7b31dcd45a73f5fef6409e323c1fa99c90347ad. 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/GBCEL2303227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca92e31a9a9911a6abaee675318e53223ff5e28ae2ae00f22c6d156f9f61d00e. 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/GBCEL2303228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0536583af17210e8dcc96a87656b2a3f65a475f1b1dbd8746d8171fbef3fc442. 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/GBCEL2303229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2041bb657a9a8824c1ab597709c4181953ee88e066d1ae31bd9823e71af9b724. 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/GBCEL2303230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4f21ca205831fb7e8cb636d1b7de4b81cb6884a097d6f2987697f2371a9d063. 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/GBCEL2303232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99529db28413efbb2ac4b627098a02dec859b190eb4c9553235e5f207914c906. 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/GBCEL2303233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa82d3b8ab83397b4b98a1820e32c5938d7ef539bca748140be05a55af3e38c97. 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/GBCEL2303234.