DEFA (Deutsche Film-Aktiengesellschaft) was the state-owned film studio of the German Democratic Republic (East Germany) throughout the country's existence. Since 2019, DEFA's film heritage has bee
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 0x74f3cff56e2f6ebe725685e2bcf0c1179eb2319203497de5756bb02b9a4599f3. 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/8375a037-527e-4323-8f6e-863f39d52841.json and https://artists.proofprofile.net/proofs/artist/8375a037-527e-4323-8f6e-863f39d52841.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 0xf3771c0d5c40c33c144a344ee37ed63e64413afa3b00c654174961227909cf6e. 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/FRS182110620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02940c5addd6d96648a4500e111b2852560be370849cc005cf400eefe3ece21b. 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/QZES82279332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c3b100c7559dc66ca769c23649217d013f57891d0b0b175d233e364379bb9e2. 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/QZES82279333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cfc038d21020b06a69f6f45f47ca79b03987e54da724dfa5699d0a4846b19b1. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/QZES82279334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eb0e716b8ea1d0628776a6638bd93ad1444e5c7b798b603c2812b1f6075b90b. 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/QZES82279337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa149eb84e7a733602b2a243d528a9f1f0b934a466c3da2bf6af63ef752e8b3c1. 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/QZES82279338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcba63a55ad7c30a44fa57ecc2b5e76933dc6fbbb16c159214a314f119d9c5f8d. 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/QZES82279335.
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 0xa553f03c66634e552f7c0314c92a3d8545cacbce33433d000edf4a9f289bc902. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZES82279336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a750de8cee75c871890a79d0df109c68421e530e875b843355372bf34095e4. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QZES72209765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf9984c3c986714b89474dc2dd794a13988735bff7506ee0fb73e47782f34196. 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/TRCAE2200185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe752d293a1b68bb64981436f01a1951eea1ac61d22c5aa0bd398f830de58defa. 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/TRCAE2300096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a1c3b759083c31d810b79d89aac15289e2912417cb7faf5675f0b8d26ce2d97. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/TRCAE2300122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x685ea2fada866529a6ef1f98c7b01ced7b125c1ec32fb4b59f8d5f5eb9fa847d. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/TRCAE2400023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea76651690a64cb932c593aa83022a6c19358b2c541c6f98e1e3dba2be4679c2. 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/QZNWZ2461312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14c1d0a07ad1dc9aa2130d0a1966b2b3fb610dfd3a43c58906975e53d7e7f8e3. 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/QZNWZ2461314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35dbfa54a992c583f5ec4139d763ce37d67b72ba9691aa2cf56af871a433b6f9. 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/QZNWV2459024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f51c391517871ac645a4f06a0492c8459c025d57a3f73c5268fd5b382c095bc. 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/QZNWZ2461316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8922661123052b333b1a1265d900bc98af99b106e54298a8873d0a3847f2240a. 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/QZNWZ2461317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3271f07f6e53e960a0f4f519b7c3ad7ac7193c37a6deff280d01e262f82cbb0c. 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/QZNWZ2461319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c9d9b4ffca76d319a1aa2e033f54250fc6c8948ec290196ae825c581a461cbc. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZNWZ2461320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc123c91b6bd9f3eda8dc18363b495878c78ae4557f4fb5460b8321ec57a58bfe. 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/QZNWZ2461322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdf5f9c1db6abb3c39d1d7bb7bad4719181e260592e34eef6d371d3c9bc2e24f. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZNWZ2461315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73ed2479e87c6dfa62b06353ec6ae93247c5722a7f01719eede41aebf2b3b2e3. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/QZNWZ2461323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb03908918fc96bc2fc226f0e7203e2a38cacb48b50c7f89db7bb6890d2b6acb0. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZNWZ2461313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d9de12c375c2cecd8db4d339367407514c4aaecd6ad189ebaad958945f25c6a. 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/QZNWZ2461318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d55735b9983db1b0c8012ba6c9e31975ada91560b6562c0c4b2cd9cb3db5bef. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/QZNWZ2461321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c215def0c6275d8cbb4e504ff0e10f0fa63a264fde8b84756233ebd49df9644. 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/TRUM72200272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e7a760dcbcf24f1bb5dbac448d239268e6fdbb973de7a04f6cbf9f55ffdd11d. 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/FR26V2072538.