Christian David Sprenger (born 19 December 1985) is an Australian former breaststroke swimmer. He trains at the Commercial Swimming Club under Simon Cusack. Swimming career At the 2008 Australian Swi
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 0xc8cb1b5bc5734b31d14a6bc45f58e182e8701513f8834c63eb33e102df7e25c2. 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/d84c0e3e-e6de-4078-b16d-6a0089dc1ac6.json and https://artists.proofprofile.net/proofs/artist/d84c0e3e-e6de-4078-b16d-6a0089dc1ac6.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 0x3271a8326b93ac459e31bbf4c22ea40ce8caca8832fc36dd9c4a1c19d951c217. 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/DEAF40900311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc39356dd19d345b44c760452e1cbad9b8c2b911f6a23348010df36adb2b5c8a4. 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/DEAF40900312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe56bdfb447e1ec1d7c2656c4e85ea0f6145916b3e9d4fcf176bfd7fc748fc21. 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/DEAF40900313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbac3e42fa7d667a65304a679d871c0d9ddd4beb2e03aead946d7ccaea98bdabd. 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/DEAF40900314.
Paraphrase (Großer Gott, wir loben dich)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e681c562f6650661b081178f0233e91ad39d90c5b199fa377857072be831f9a. 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/DEAF40900315.
Lobe den Herren, den mächtigen König der Ehren (Choral)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88b184b25d19db517a6f2c8f9d2faf9ea109ab293a1eb377d1edfaae001fa0a7. 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/DEAF40900316.
Lobe den Herren, den mächtigen König der Ehren (Fantasie)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f06a24fcdc446d596d2314a5314aa07e578887326900c00964aefae605bd75a. 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/DEAF40900317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1a3b06967d1e54301206bb24eca22aef0bb0afc8734694da63bc85202decc14. 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/DEAF40900318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc968821a72ab4af10f1a5d0a9537b5cec7bc9c5ac7459b8cb10bd7934fed0fdb. 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/DEAF40900319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65014c42cd5fd6a6e75c2dad78f78844fd38d11b69941bb41e76d9d8f8fc8292. 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/DEAF40900320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23a073c987d3c5c08acdef829bbbc9766714793c08008169ef6f3e7cf313d661. 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/DEAF40900321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01631a67c2e0ce7dfe2514d9f8c31541d8521dd7f62e745eb277960f29723d35. 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/DEAF40900322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2741bf679c3e100972f9fdca0c5689dddb21cb1a5543d7d33d78063fa4e02911. 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/DEAF40900323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6c4ddf515e6d1ca6a2511001e33ce6cd7a76c267a047cacb1ef5305d4de0b7e. 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/DEAF40900324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5df950ee9dea7d7a77da4d211695c830e17922883234618b550d1ff6312ebcb4. 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/DEAF40900325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa27285fa6d96070b8032a1cbcd3c1eff119543c66949138a467d3d544ec4ee4. 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/DEAF40900326.
Hymnus (Lobe den Herren, alle, die ihn ehren)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64a555e58c5c42ed2c3f1bc4821264078f6d2bf411d404e52ef3ea47a3b75bef. 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/DEAF40900327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f95f43fe7361aca7a4c250db4018fa3a0efe3ef2542690407c4e271714fd75b. 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/DEAF40900328.