Martin Herzberg (1911-1972) was a German film actor. As a child actor he appeared in over thirty films during the silent and early sound eras. Herzberg was of Jewish heritage.Prawer p.213 He retired
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 0xd6ba6de5bdd140ed48e16d2780158aefe3622b3a5409ef0c1dc37a40b4bec82d. 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/a78542f1-ee15-4f82-ba9c-e15e4c1afa1b.json and https://artists.proofprofile.net/proofs/artist/a78542f1-ee15-4f82-ba9c-e15e4c1afa1b.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 0xdf8a1d320d04ebd0ed4bd3870c9b5b465c3ab8f211b7ee6e3ff5a9c2b279f21e. 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/DES382328003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ce8cd3533b10361dc365a0a98448034b6d75ba3277d0c3808bc14edf1bbbd70. 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/DES382328004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedb076d8066745a9fb0dae8ff31f541d05b39694a8344b2de5a6fdc264a47b70. 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/DES382328005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe500150de0e90bc96b1c344bb0f5b3e1359a1be356d2486e7d3cb98abf4598d. 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/DES382328006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3c6bcf0e3b7b08b48143fe1b1d56b5319107e01a4b405fb898134f08eaeb024. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DES382328008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52be7236b70dcc9ec7d3ddb8ddbc572bd31e0aa54b40bb66f223b729fb2c51b4. 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/DES382328009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x014e1a602ac1b3c5562d246661bb6a03f8c6a529b6152366b51113607fa1a589. 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/DES382328010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c5bb5f8a5d010056035a731e52f52d8df69911e331e027f22edbe484ec408ba. 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/DES382328011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0697a02713f6038db7ab45d2fd9ce4db06cf590cd89a2ced58ed765a5d72816c. 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/DES382328001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a7b4489cf430d10aa34141dad23aa7afafc9a5ca12c094d25ad868542502874. 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/DES382328002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8e7ea9b3a7990d4f9a7460cf92b705b26642a119ceaa895e0977e0db384fde1. 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/DES382328007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fab98a6dda2abaf1f1f25bdc0624ea0e71092bd0cb053dcb18a134e645e0b0b. 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/QMDA72206652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16d2053bec0fd78c63950356b19d1dd7c37903c530d5724752281b2b684bf534. 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/QM6N22294227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa445217dabb7c40fb3f98c6196738f7de8442295aed6c8a75d75eed1b4e0c129. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/QMDA72206644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44360785b2d2648bedcbe0ae966c39a39986946eb35c6da8bbb0ba2fc88ef7b0. 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/GBWUL2284967.