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 0x2248cc2507a590985e004f2455af05743ece3ce2db64e0309858b1fbadcb22db. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a05e8b87-2494-4111-947e-0a60922e9c36.json and https://artists.proofprofile.net/proofs/artist/a05e8b87-2494-4111-947e-0a60922e9c36.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 0xdcd09d77c900430c8b293f69f669492513e2545cf8d278a610aa54a83d210d6a. 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/FRPIY2000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc72dba0f769a512a3750d23060f41fa2495da561631de08f50b4c14d91e4c8a4. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/FRPIY2000020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaed780efe22d520b58efc8cbd702da38682ec07e03415cc67243d98f9d9597dd. 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/FRPIY2000030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebe74d4682c6a294ca1e8f011086b990ef3403c20224097502e47db4bf1d5a35. 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/FRPIY2000040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3609e1960941a4814c33995a704fa9febb8ffc4fccede9c81f075281aac4cdb9. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/FRPIY2000050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe21036b65f495c38eeca2201a875a1286ba45e576bfe2073d9401ea5335f3f68. 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/FRPIY2000060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb66bb0f44b086ea62374df727f2267b710d3d26edfd86d25665a37a74f04d94. 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/FRPIY2000070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1c2862fbc4e31fed116ac40fb772cd74628063e4a85509c4574be9afa1e57a0. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/FRPIY2000080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b005e9a365b2ff6cb6df65585263822331f8fe578f3b828dd7538198ac57f0b. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/FRPIY2000140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fe2ed6e9ec9fd266a8d21e79d1d0ff68f74afe5bb7550e7bc199160fc84dcb8. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/FROV61715901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbac9cf4330fd78a5bc2b4e1178aba01513969ea4d97474a45b7d3b93da17038. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/FRPIY2300070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35151de6925fee1ef330e92c3b68ae6cb194a1a2f3f10747c3f30564c752708d. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/FRPIY2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5506be2f597cfdcee522431a072f6a906b547091c54b988aa0af92894c46e951. 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/FRPIY2300130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14621e2089494f41a670540ff14f011fba1d007d1a6305e7704e114fcef10805. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/FRPIY2300020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa237584d183c00776ff30c1c8bca3b955835f7ef342b193e17e0300a19daac39. 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/FRPIY2300030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2531eafe1efe6b72740fab8ce0b338015927ef4f57de9b2a3d73da14f63d148. 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/FRPIY2300040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb37668630bad7cd870ee4554978aefbdd7590b1e17aa1eca08828cd0ea291c0. 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/FRPIY2300050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd972c5405d47dc25a04182000e6ef8ea0c20be27576e57f7f561bf26286f282. 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/FRPIY2300060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbac9cf4330fd78a5bc2b4e1178aba01513969ea4d97474a45b7d3b93da17038. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/FRPIY2300070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe9c60fd79111599f53f43a53d4752f4616c35d95137497e89a8ffa050c54ce9. 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/FRPIY2300090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1dcdec6a8266e026e0cf0b8c1d2f2394d94e1efaa5f6694a0a9a8728603457c. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/FRPIY2300100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4b689a33ccfe6d23efeb40bae385231c9895c708668f5f29585ab0ce12ff4c3. 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/FRPIY2300110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa783304fdbd426168465bba07622d3c675b63f5ed7ba11594802f6f8f252cf1c. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/FRPIY2300150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3051409ec29a8b12fbb5fabfe59ce113d534116cb204b86ce638611697b396be. 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/FRPIY2300160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x995848ed102b5be41c5e42475aa5ed988b5c39a1b3f63210d5ebad365768a652. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/FRPIY2200140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab34e58a51d34f95033f24164dfc746abbf47328863316d50a8624a497bf920e. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/FR00W1900107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53f66333ceab492a6c3e7728efb0c73c6043fbe01bc30556e96246bcfa04817e. 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/FR00W1900108.
Winterreise, D. 911: III. Der Lindenbaum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e774aeb90c131f18d4dcf650699369c13799a8ada9c69ca0059b2c1c97d2e94. 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/FR00W1900109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ddf669d1c4a09bafde01b0c7fe180b9e8e55c7d43ea935454ec08587609e721. 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/FR00W1900110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc39484b5ca42be7d399370e7c65dfe211685ebb6ab61bb77f1442cd6d9eea48. 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/FR00W1900112.
Winterreise, D. 911: VII. Frühlingstraum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c5e503d4703532964c68bbda985cdf8904ce4348544941907a9254d0fa63e7b. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/FR00W1900113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ff9133cd5595eeaa759ad517568e27896675e1c82a1c09bf2a582c777c46f2a. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FR00W1900115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fba339c355ba847afa03173a1c32aa61738e24f1262748b1beedbfe8d21a127. 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/FR9W11110024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa237584d183c00776ff30c1c8bca3b955835f7ef342b193e17e0300a19daac39. 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/FRPIY2300030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x995848ed102b5be41c5e42475aa5ed988b5c39a1b3f63210d5ebad365768a652. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/FRPIY2200140.