thumb|200px|Giovanni Marradi, 1888 Giovanni Marradi (1852–1922) was an Italian poet born at Livorno, Grand Duchy of Tuscany, and educated at Pisa and Florence. At the latter place, he started with oth
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → block must exist at that height 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 0xb2e941dddaeca3fff5f405a2ceda631df647b4c7124d70be7a01710dbd2036e2. 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/4f8cc01e-c54d-46b3-9954-17fe75914a42.json and https://artists.proofprofile.net/proofs/artist/4f8cc01e-c54d-46b3-9954-17fe75914a42.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 → block OTSBitcoinBlock must exist at that height 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 0xbe8ee0894436fb307e1c3ad73645e69bbe8e0422e36bcf4cde0c036270a126be. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/MXF331201077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aca7953122faab04d4c80794ac344cf553c68a7aa131a96e28d16270c56f660. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/MXF331201078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81132cc35fd6bdbc3f664d07f3463314c250a1013be46003e99566bb192eb9d1. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/MXF331201080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76f3e37edca5508aa68ded792ca74bd0712e29dce9da5abb4451f8fb2c4ca2ab. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/MXF331201081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0ee4ccb02e2cba278c94ebae6480b51648e3f68499f4b47d3c699a715ff7c8f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/MXF331201082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7cdede88e4186f859d0e1478698ff363d5564a8a4d7e8be6a2aaeba2ae164b5. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/MXF331201084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd13e474c6955606586c5526844dbd6c56b3df53b25b547464134db66ed8d8f38. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/MXF331201085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x495ac6199a7abce6e982e21571b41b5e10bc560630cf91df7c3a57b616a9e71c. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), 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/MXF331201086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ade1c52fa0e2c78481a5bf97795045cbedd75da33bf1aa64caeb7700c7cb471. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/MXF331201045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9633ca27df7804a2b9c6a60fac643e8e7f19ddf09fc58d708ddf2b9d520e623f. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/MXF331201046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d4481b3531d050de0f4264a38494e5c7ea8b0aaa0c1339d98e04a337ed75fe3. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/MXF331201051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe8ee0894436fb307e1c3ad73645e69bbe8e0422e36bcf4cde0c036270a126be. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/MXF331201077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aca7953122faab04d4c80794ac344cf553c68a7aa131a96e28d16270c56f660. Chain 2 (Bitcoin): anchored in block 957801 (2026-07-13T04:17:08Z), 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/MXF331201078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81132cc35fd6bdbc3f664d07f3463314c250a1013be46003e99566bb192eb9d1. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/MXF331201080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76f3e37edca5508aa68ded792ca74bd0712e29dce9da5abb4451f8fb2c4ca2ab. Chain 2 (Bitcoin): anchored in block 957876 (2026-07-13T16:00:32Z), 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/MXF331201081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf9e2e8c2c2a6a696489dee2c368cd483b0f025f019d6c3bcbb13b6202a2d5a2. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/MXF331201083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7cdede88e4186f859d0e1478698ff363d5564a8a4d7e8be6a2aaeba2ae164b5. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/MXF331201084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c3d6d8f7c709d0d07ff693d72f5b917dbd5d633e98ee88deb1fc81d2e16b931. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/MXF331201356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeb5dca7bb0cbc543aac701ce89a9982e000fc51c8f43cfdd8a5200e7988e92d. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/MXF331201357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1cb50252206e9cc8c60f1d49feea23f91b1ecb08c33762c201add9195c86f97. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/MXF331201358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25d80d9bf0ff03e0d7ee33ffdabeaa1464b64e5b3d989a846000d40b201e9da7. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/MXF331201359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9f6853a3d2fb424b1d4870ed4e5c5704b80fcc0e8edf0106aa37399033f1812. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/MXF331201360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cf207eba2f7896f9d94c13a648886ee1e2d4487fb0f4b3cfb318ef4a5ef6794. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/MXF331201363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf14ecc8fb22562ec9a7fde073ce8afe9175d2e4a487479644b0d6da9bd3a28c6. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/MXF331201364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dffbb0017f19180f3961fe4b43e834089f15b133ceef56b1ca0b3844b36769e. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/MXF331201365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb21257d5acbd56c0ceb362a29bad131510213be4e9fbdc37d13bc2d1c69b716. Chain 2 (Bitcoin): anchored in block 958384 (2026-07-17T08:27:02Z), 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/MXF331201053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1acba680b2b76266e337e0660fdc34a2f9bb4f914037fd2139886281f803917a. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/MXF331201056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9af2abefcf820de5cf9fe8a17f62bbee6caefb27e03a2ee716dd44b993613849. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/MXF331201057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3c628424a3250a5fde12b2d466e47cefa9e536453fd4b293a877d6ba07bea34. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/MXF331201058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x231389b6a3093392b930a33183d48ae925863b390a7e5bfcb1305a6e27975e99. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/MXF331201061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb24378b54ae6c633742247aa43b04d0fb764be988a3007ae6c2dd3fc50f08bb7. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/MXF331201062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3161ed986852d2ed86e8a881ac668d3bedab24fefe2f6b06b9bd02b956d76fc1. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/MXF331201065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed36f45202b8e4d5c19abb9972abb5f69c62afc0d571d901cdbcdb70e759d0f0. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/MXF331201066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x755079f4df3492110baa2aecfdbd8f5c51f58c301553b6eb7160e7845b67c21f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/MXF331201067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd489d179ebc3855cbf8addddc03578d57032e14c21b0cc07dcf42abbbe2677f2. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/MXF331201068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c3bd8de881d713936d6a10e1ae16c2a73a2a959146082febc1942753b644c74. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/MXF331201070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dfb4446315c4458d2dcc0bf2e30b01f0ec00335ce5e2684da29d47693943a2b. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/MXF331201071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa03a7d0b5d56ba10cf6a2ab4f8b0ecdde771632ea363f544d8a4b73c2010604. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-19T23:56:22Z), 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/MXF331201073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dfcae53902b73202d24cad54c14715e55455227102833df80798e5013534519. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/MXF331201074.