Jan Fedder (; 14 January 1955 – 30 December 2019) was a German actor, born in Hamburg. He was best known for his role as police officer Dirk Matthies in the German television show Großstadtrevier. He
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 0x1c0fd64515b336c3325daa622a9ffdd4c5f44eacb91307375492b06a4bf4945a. Chain 2 (Bitcoin): anchored in block 953616 (2026-06-14T08:58:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1bd5050f-d3b2-4e61-b8dd-a98593d6c285.json and https://artists.proofprofile.net/proofs/artist/1bd5050f-d3b2-4e61-b8dd-a98593d6c285.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 0x36dc2e16636bb8a553a5bc4a9e7f6af76f199703b5a433fe0780cc187c82eec8. 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/DEC831700138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd960a3727bd136c4918811942eb10a9e331a055c3c2748a48ac656ce7318045. 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/DEC831700139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44a8c14be30e2da380c1f760caea723c7415da003b83e1e33dbb91fc05c58151. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/DEC831700140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76172d467e5a98925ee62046203f60d7b8cdbf6673dd500552ad27286e8a258b. 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/DEC831700143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f17fedb90609dcdf75eca61a2970033b9565a0464aa70cb24d9463b58109ca3. 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/DEC831700144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6130fcef87ee9118aa06d4d2b07155ae6f94744be9b9b6b6116b7ffa0a1acf9d. Chain 2 (Bitcoin): anchored in block 957304 (2026-07-09T12:19:34Z), 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/DEC831700145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90631fb99190a0a58e8977861d8601cd85bdf9036171cde21308f62de021fa8f. 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/DEC831700146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa40ee5f503fe32c41380aec437a0e9e486c035ad685a0a5b79a5833712ebab45. 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/DEC831700148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeac4cc01de4f68e427c13295775b845204609508f34eddaca6fa85af92a1f2f. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/DEC831700137.
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 0xe215e7c773970e12e41db65f05fc3165afe1b17426e3eb5f532bf00d0d72221a. 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/DEC831700141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5837fe6c34babf637e4549bd14aee07223432a5395ab2eb97ec35282a06bdef4. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/DEC831700142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa59c93ea15203acae2fba07f7f4d0372a760ade2ccad0ed8b52bcf5698af6c1b. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DEC831700147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76368974a125a0ef73ee87b09183eb83100ea2f6bedf28a810be5c1d2cda1a26. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DEC830700769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7502fef3010f6b69494e8666c110410a1bd540c646d352305a9f94014fd9a948. 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/DEC830700771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43b19808f5e1823d181c5debd5762439c238205a5041254f6fac36e25d6426c1. 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/DEC830700777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe965a6ea19604ac7eec7851b85d08a9ccf3cd964b476487b0f57df17900d1164. 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/DEC830700778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe00427a5df079bd985cfccf4a88182e71bda6f8ea35cf15e31c286976d4836b1. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/DEC830700780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9a1b33b01592ac95d1ecf6519e180b23c099d5a5f7884477822c64b35362fc8. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/DEC830700784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f85fba167bb0cbf2df3837591b63a88761e7083d9731642983cfa99d73f7510. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/DEC830700770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84639cee8676548a0e017913bb0bb7a2becd08ace5ca5a9c6cb7926263a921ed. 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/DEC830700772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd883b04ff591b7e73af7816c7f27f704a4cba2e242cbd54568523d3da78f6774. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/DEC830700773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f1c91d69cb0cab79d45ecafeb03273dc53d848780db1816934048edef86bfbc. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DEC830700776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe1276700e2a9ae6e880e256ad4fce6c82e0e4def497b8420c8a9c760e1920c5. 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/DEC830700779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaf549a4bce7495dd9c09a9b7b2da2246b2c8d17d0d34927e876bd962e66fbf4. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/DEC830700782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf2b5f769d390e78de762d848f29aec3278cc8a57a56d5469b7755c95ae4df68. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DEC830700783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x601f1a2bedf10b34e53942bca626a9986ef095e22ba8448eb9ed8efd40421777. 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/DEK891100020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa30805bfd3e04a1df073f5eebe2ec139090406e5a8197504e050237babc12b6d. 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/DEK891100030.