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 0x962e26e12101c1c9a938e78d51d31ed6763689fe0f72309b08d53dfe198e8659. Chain 2 (Bitcoin): anchored in block 953736 (2026-06-15T03:21:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/980ab38f-2f9b-4f83-99df-8fd38e51d354.json and https://artists.proofprofile.net/proofs/artist/980ab38f-2f9b-4f83-99df-8fd38e51d354.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Musik-Parade - 20 Märsche der Deutschen Volkspolizei
Wir schützen die Heimat - Märsche und Lieder der Deutschen Volkspolizei
Soldaten singen (Kampflieder der NVA und der Volkspolizei)
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 0x5ca40f60abc5dcee5c14d2ac2f14e5fee253d8413e8b6bec61b4b1d5d24aa4f1. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/DEE700001490.
Thälmann-Lied - Heimatland, reck deine Glieder
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73589b07d2b8eec4327cbe883042455cd0d83e7784193950e6793f6a0f66fafb. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/DEE701303265.
Die Thälmann-Kolonne - Spaniens Himmel breitet seine Sterne
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f174f0a8a6c04f0606ce2056e67cb19d487f740f98c3d3b4433576f0ec6c8dd. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/DEE700001498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6540584598e35b237148e8f4a902ec4d919876eb6295778d55bb821ba9299db. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/DEE701303266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9704ebcc8e250395c2de1ba09e7decfe3baf513483b7655cedf23abb6b6b233b. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/DEE700001502.
Sozialistenmarsch - Auf, Sozialisten, schließt die Reihen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2581cf09e024aaf9264853ec7e34026cf511a610bb28a425093a2f54341f18c. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/DEE701303268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabe280a345a1314a94f660d7bd8bb269f3a5c186a22bbf74932e60f124f7f7e6. Chain 2 (Bitcoin): anchored in block 958731 (2026-07-19T12:35:36Z), 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/DEE701303270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbef683ee26a69db0c78d0daaac32c5f0b090035e4d548deeb587d732d12843d2. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/DEE700001489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66dae4b796be521c3eb91f9a174b55693697aaf7dcb1ab58a1a500a2214e95e7. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/DEE700902711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x042299fd69c330578932fe5f2656800d66ee527bec2296d435ae0821f755e64d. 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/DEE700902710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd00d748ff137b51f721ab0228d89c084286622d1ca82050280c4449e73fef6f. 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/DEE700902714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe9e4516b0899a1bfab0acb074a64fe664625b6d146816824457de466f036a0c. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/DEE700902728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8721117351a1785b5e4f274aacc40e94e030365be8d85d5823b70f4dccc753fe. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DEE701803928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x464a5d3c0b51943ed3adec421538bf7a8e2edf5ea3030f865482033a2ef23616. 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/DEE700001858.
Der letzte große Zapfenstreich der NVA (Am 4. Oktober 1989)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b17c056f8958a7b28de0e0f8dcde21d2d0cda4b80dd889620b67da17fe8c20d. 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/DEE701303172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58b04ed60352c6f49bea069fe7bd23276cf1c7da2db643acd783900510c7f144. 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/DEE701303186.
Marsch der freiwilligen Jäger aus den Befreiungskriegen
Lützows wilde verwegene Jagd - Musik der Befreiungskriege
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2b58c9640fa11f702e643ae2a0aae47fc5cdce93d6a637de9dfd377cd2570c7. 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/DEE701703579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x042299fd69c330578932fe5f2656800d66ee527bec2296d435ae0821f755e64d. 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/DEE700902710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66dae4b796be521c3eb91f9a174b55693697aaf7dcb1ab58a1a500a2214e95e7. 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/DEE700902711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5f2f94c02ce7ddbe849fbbe73fdb75fcc6e709771ae81a676ba32f00a2ec611. 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/DEE700902712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcde377e2cfadb18dde9ef0e8561123a908d5e8e88668d28cfdd5c46179719dc. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/DEE700902713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ad85f21ebaadc87aac3287f55fdf1ef7fd4f2d6ad1c83a9c587475d00941daa. 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/DEE700902715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca25f9c04e471709bb607ef5073612539b8f9f55c7e109a5ce0b3595f83cce72. 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/DEE700902716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25e03a4c42d41cdf65d7567239ac5ec2c3fceba9568b77cbb93ca2c2f2b4d3f0. 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/DEE700902718.