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 0x9497f6195f99f513b87de7be0adad4b679d8beff973e909abd703ecf3ccfffa5. Chain 2 (Bitcoin): anchored in block 954638 (2026-06-21T03:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d3353dcb-98cd-4e61-9166-3882068986e9.json and https://artists.proofprofile.net/proofs/artist/d3353dcb-98cd-4e61-9166-3882068986e9.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 0x01a876202a6ccfe39598fd0cbbb16312e4c670a1d9f53f76ab77cfd9282a0409. 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/HUA257107101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3c43dbb0723467599addeb4091b519d4b55b3ec7c4710901b4a8fce7062ed4a. 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/HUA257107106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2a5bec4d2ea00dda46dd1b0a1fe1c47525c5bfd7d801ad7a1f21916db90ac0d. 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/HUA257107107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fb6914015b3de19ec25207f793bd7af56242e3bc9b3f1d699f6bbc8be05b06a. 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/HUA257107108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39eac244b4bb1626052a2312389c6590c6d39d01df715e8de554fd5893013989. 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/HUA257107111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf921b4f73fa90c44c446b0f59bc0d7353fb200b48d1aa3083760dd900179c984. 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/HUA257107114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7f03b00480874e96d66fc3b409e1c582b795a65790ad842747b64d50b406e38. 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/HUA257107118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92e62e1c91abdf936ab84b2bfd6eb85b339a5af915bdaadd1110df5221df0184. 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/HUA257107121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25ef78d524df0c8fef5ba599fc57c6d13e4053e619bc7158c92e7a8871fac90e. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/HUA257107112.
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 0xa029377f03cdc6b5addcfa643c21cba9b16433b4bf171b8fb4d1556378b6b5c2. 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/HUA253793301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ef5561b048901d02d7bcd81d660b57ebc326f74bc22d2fd1355869939bf07a4. 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/HUA253793302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e5f8c1fb484a24b8509161879afac00b1c7eb70f80f8e4e70577df7b05d9968. 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/HUA253793303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb16ea97f630214a0dfe6080e4a05380438873b66ea8c7b800be0e235a297481f. 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/HUA253793304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16a95f815c2f797ded3fb5e390676082ba3a5057ed9e0cce3b962d4790cf011f. 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/HUA253793305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dbf107f249a4f870d462eabfd24953082bf00a0ab71a5d6a4bd8de0821e0cef. 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/HUA253793308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe65316a3af6b2bd403f9ac451d83dbe3ea9fc967a6e7680a3cc45765182b2463. 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/HUA253793309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19aa0952fd309ce2468e955af93f69a8aa293a210d0c8be37bde8b19d94abfdf. 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/HUA253793311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x665a0d6b1f5aa93406d5585626ebc54014e298eba718bd8d781d6311e1c4edac. 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/HUA253793312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfc5544d5a007d9ee9daf281b2a93f957be229cf664a72cdc63341fb69d6801a. 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/HUA253793314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf5e83a6279e034fabdddaf220bdce1a74da0f93ece9f48d666763549abdac0a. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/HUA253793307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5bb362953eb0d84536d38dabc04181901559ade660e581baefe7a897f427b5f. 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/HUA251750706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ea6bc976c812b083cb894ef60a89ca4c2f890fac249515f1f30d9294f20be95. 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/HUA251750707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98ef243550cfe7cf4e5676e9e3934b78d0d0f36857c2cd03922d36f310174e42. 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/HUA251750711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32425395f0629bbf39bc2ce0d990469ce1f679fe01e21918ad1952bf6588e46d. 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/HUA251750716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bfa284b8247dea5f780d1a9a4e381008398b804822de15b1539721b6bbc56b1. 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/HUA257107003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3a50be02036e12d10bb747f52d296fa40da774596b79b54c18b60c7f851d298. 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/HUA257107004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8a00ce01fd720e2b2c734e7f246048e5f0ac46c5655ad06253203dcfae5f3d3. 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/HUA257107007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38ce14e6d11a9b2aeb47dec18530ec2f0e25c9600595535ec46f2f4332a48629. 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/HUA257107008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7abf06806f01a973c92cb094996c68ef8f2fbbc4d198ae40b0f37133ad7a66e9. 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/HUA257107014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4d56d6b1ef76bb8af101d2001a1c2022f7087b1f3a179b7a2b9c39f39351c8c. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/HUA257107005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x583d3eb7bbd3c8238af89c7d1b0dc5295a9c62ab0cfddfd3abefc1bae15b65a1. 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/HUA257102101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38e5657c370f2ddaf68585c03866de2c2900f72243b8a06de34483ce7d20a039. 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/HUA257102102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa410b49369fecfb7011e45c9f815ded641af8c132661890493dd1f2ee104b703. 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/HUA257102105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d3936156cb522d5bd3dc9ad354a160bd910407c24432414a7f086b5e11c9314. 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/HUA257102106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1d2dfb67e2e2f7d7ed657571a3cfddf91f582c800ab115162e14cf50517927d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/HUA257102108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69d122471b562c29fccf1aae02dab9f3be5855c4b34b4d101d0f897c0812fbe7. 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/HUA257102111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03fa921d69fcc93d985f0bf1b18c96c38cad5a8ddcdc2731f6024b87fcc48c0a. 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/HUA257102116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4cbda609959c922f1779b5a119882212c6dec6d3515e5f2bd92b2ea124e8439. 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/HUA257102110.
The Hungarian Song / Anthology / Recordings 1955- 1958