thumb|Sack of Rome by the Visigoths __NOTOC__ Year 410 (CDX) was a common year starting on Saturday of the Julian calendar. At the time, it was known as the Year after the Consulship of Honorius and T
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 0xbcb5b8e362be9e52b8541954720973442b06fe8d0b5aa9f5973d59ce579735d4. 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/bbddea8f-0617-4725-adcf-a73e282b6a9c.json and https://artists.proofprofile.net/proofs/artist/bbddea8f-0617-4725-adcf-a73e282b6a9c.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 0xec8a79b0721c01d7d5af3c03170fb5acc9f46bec82f786aa3073ed3cb3aef5c6. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/USHM82100667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf29cc56109932de0e67dbcaffc5a51f289168f8da2416f7ab137d12fb5cd7999. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/USHM82100668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfb4055df6d7f1ed52155415a4213c22e91c1f527a67d9bae7b16e63b7b7bd43. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/USHM82100669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd8b576bdfbf1cb85ca1a73fe359eb52e81500ab8f4a7d6d9ade261f75d43eb7. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USHM82100670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41d062e201f35ec131dea2da1ef2423a9422a64d4a542d84455220d7f825dd4f. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/USHM82100671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x154dc931af6cf01a43b3b2b81d31252db642efea76862b3b7d6342112c6c70ec. 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/QZMEM2272587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62b8a398005c046286366642843c2947d739ece2e2d5f9e16f62724bf1dd6bc6. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZNWY2266379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23cddcb5a761f939fc93e12eb3b3ff7a4958d2feaa1ddc1f48e9d6728439c437. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZNWY2266380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cf27c413d04d812e4da2b6d796ada04b0b06242f3d6b8500d00d238b353974a. 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/QZNWY2266381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x457fd95f664bf4cafb046122c1ad7619a65c750144e95c3a5928113943acfb8c. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/QZNWY2266382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c192071151a2b9eb65ed94a418f6f19a8f8cea94118f697eb56569a6885861e. 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/QZNWR2105058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x701f234fb9ee129bdc7a9c99cc5f43a6ae20fbb27288b88d162bc3048c759a53. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QZES82243933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95318cbbdb1bd29b0d8ba31aed12b1b964719105d818bb5b44a1584bb663c1d4. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QZNWY2266383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1b93eccfce5d4f5e54c65d7284b2db091ed199736efadc91d0f1f5a6e7242ba. 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/QZRP52127871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02b25e01db347abd533d542b10593f0577d90dd6e7f5003d6e5b10c5320a4cb7. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/QZNWY2266384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fbc2787366a3ca599022658f675f09c9612c5fb6aa658231bbaaeb05e8e19b4. Chain 2 (Bitcoin): anchored in block 958776 (2026-07-19T20:11:59Z), 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/QZNWY2266386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c9fea99c28953c282959b5932fff03c337a046c9c82085548f3dec97d90bc04. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/QZNWY2266388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6841372d1a54bdb9863c2de23908523197784c9dd86e3e5625fb323b0e9df5b. 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/QZNWY2266389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4ce31bd913d0996e96e05fa42e8ccfe6fd7c0f61bb0aae969ba11da4307e4a2. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/FR9W12256425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x338cdee47e5247331dddf535fd4e04b02bbd5a2bc3e874dc7de10adb144e9b06. 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/QZMEQ2437154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d9fb8cab791386164c670cc1fd9865bd1d7628063704be5bc2977489800cd57. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZMEQ2437155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa06c0cb7e2dc964def5e9aed217e1373b453a411b1e892297da8cbc4ac369dd. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZMER2408152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc15f1bd64c7b921a7e0f655a2524f5d1d2405dd649ed29576ceab9b77b831777. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZMEQ2437157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cb0c5d621739781dd6a49f57071ed63b61204385da05587870e036be7fc5044. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/QZMER2408153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x437847fc431223c141f9fcb9da39a29819a77fd8484bb32b803b5a6d61b13733. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZMEQ2437162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c5ae751b59c7e2f1386dae293c2834eba67c85f4fc8fb4089c1a4297409503e. 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/QZMEQ2437163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbbbb4be5d9366901200db33566aa4bacc85ccdf6fc3cfff3fbb5c7eb907533b. 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/QZMEQ2437164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x627683eb8a984704f97777cdb1edd7efbadca6e43a08e5af449978be6eb441c0. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZMEQ2437166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbb2e45915bdf4220bc288b21c5481b10513d3ff5dafed4e55abd899ff5fe289. 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/FR9W12425783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabbede12c7cb05e3f22a2cccd4cb1fe641dad246d00f70baa126f26da6e75fce. 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/ESA012501052.