thumb|Autographed card 1968 Oktoberklub (English: October Club), initially known as the Hootenanny-Klub Berlin, was a political music group from the German Democratic Republic (GDR). The musical style
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 0xded43fd39055d47084d7f884b66aca1bc693e02566d259ddbfab261f7313d5db. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e1ce193a-ac10-4b94-ad46-dbfcd47a7ce2.json and https://artists.proofprofile.net/proofs/artist/e1ce193a-ac10-4b94-ad46-dbfcd47a7ce2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Rote Lieder (Die Besten politischen Lieder aus der DDR)
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 0xa6a40ff6794c0c757ade1c293d65729e981dd78bc5e26f495f315e8226634276. 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/DEC731200087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c64170108e586957c4f8b9595cb7c3dc84df1ae4ed6a6fc5924a9264c0bb990. 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/DEC730701114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x952d9d73f6328c63c8f42e7df2d791e57d9165012a4536fa47cc67ae3ad7ce1f. 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/DEC730701116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6acae3b7f70c95a2e02b6b9fd74c5c0ae52d62dd108a4cb3ea4e69a206159833. 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/DEC739600022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x264b58b9b56061d9efd112f5ad01971df9ba8ec94abf84284b05af24af63b7dd. 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/DEC739900742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f81e44b6c48b66628a6bbe6dc74e3f00cd7db48221f7e82344e2aaa744bbc7a. 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/DEC730100504.
Mach doch mal einen Verbesserungsvorschlag
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa77a63752667cbc4d3ab22453459a928f1cbed99e2ede536d9a644102d36b64e. 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/DEC730701118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c64170108e586957c4f8b9595cb7c3dc84df1ae4ed6a6fc5924a9264c0bb990. 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/DEC730701114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcebdfa8ddddbb794e9f5a56e79e10e5a87026e11d1b9f9a90c5988ec591f6158. 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/DEC730701115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x952d9d73f6328c63c8f42e7df2d791e57d9165012a4536fa47cc67ae3ad7ce1f. 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/DEC730701116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ce3b01994a42fdcf42f6547847a63f61c1df3703677f49efd1bf5e17627380c. 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/DEC730701117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa77a63752667cbc4d3ab22453459a928f1cbed99e2ede536d9a644102d36b64e. 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/DEC730701118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91cf4adf2e47e1e2541acf81c1c86a1a78e1aaace8494ab4ae8d1312d9c4b12b. 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/DEC730701124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aa93f2efee7014f6f790d33ae7645d1b1a180ab7d2af3109ffdfcdc5b4291a6. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/DEC739600003.
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 0xb596c4d7b28206669e1276ab2c7529d5bb6214bb6dddb97179828c8058df51fe. Chain 2 (Bitcoin): anchored in block 960161 (2026-07-29T22:51:26Z), 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/DEC730701127.