upright=1.35|thumb|Emperor Maximinus Daza (r. 310–313) __NOTOC__ Year 313 (CCCXIII) was a common year starting on Thursday of the Julian calendar. At the time, it was known as the Year of the Consulsh
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 0xfc7468aab7fb003263531a4a780828f71fef3ac88f836983625973be523fcafb. 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/28709fc8-f327-4641-898c-22180579b085.json and https://artists.proofprofile.net/proofs/artist/28709fc8-f327-4641-898c-22180579b085.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 0x0829e27bf32754fac7240629e92372b22ef463e2a4b2e5abf34a7a25c0a00f77. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/FR9W11920234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20d6b645eeecf9eb06cf36d594b81e40217f64190c71f5a6e320341d0965adfa. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/FR9W11925841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfa47ea6007492079855a63e6afd9edd5c6d28896f573d2a3b73c5e054f434e3. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FR9W11925842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29eb04f277df5f3d79ca7ba082371e6b39cde40cbd27f7c2f27b6878369fb6ff. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/FR9W11925845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e296e79e199923596f3b734effdabb5a8c5b5cc92567ed342d03b3c679ddd88. 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/FR9W11925847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c54ab3074d3ce763e369511064051111d248f4f506146da65af882c3ef2325b. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/FR9W12014445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x876565cf541d06555acfee5779cab07b27c3a9d0e12856c56478d2adcb642ca8. 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/FR9W12035176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cd129e2515e9b01b0e9ede62612c9ff24ad9172354fe4eaea8c5abdb3836692. 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/FR9W12110700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07f3a77176408097ba92347885f6f621ffa69359f9c11860a96154d591b69066. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/FR9W12145722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42a0487b1feaf58f70aa74f9b8307b4cf017f279f75ebf272af9fd07543762ba. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/FR9W12209506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf482283205f551413bc992ba32ace2429f322f33230c6fb6ac05c6fcaf8f508. 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/FR9W12209230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d210f199d67d6f915b3a95d1a9d7a0407980474308b789749281d7f18d4c309. 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/FR9W12214134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea66b4165fcd3f58882974e71f2dd3b8bf8d593dc39eaebc3187a5ee758bab26. 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/FR9W12220419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cd129e2515e9b01b0e9ede62612c9ff24ad9172354fe4eaea8c5abdb3836692. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/FR9W12110700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29a7d2327b78dc35f9930f7fb7b9adae7fe12e71eeefc42e24fe1c38dd09b5da. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/FR9W12220420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fb4fce08c709659c7836c281231e38e31fd38220ed487dc42ab6d5fa1b91036. Chain 2 (Bitcoin): anchored in block 958724 (2026-07-19T11:19:01Z), 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/FR9W12220422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ad5e4d96231e90f6ee7bfb4152cf532139fa885a8c9d82432cea49a21a1512f. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/FR9W12302644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x565d2f5169871d26ef3abe22bba3f6a7cd2a4c9277a359968897f6b0e0a54750. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/FR9W12309669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf34b7faebf571c560bcbe458771d59f50a45d1597113353454c5b056dd64410. 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/FR8FB2310200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1519dbddcc07da754d28dad9fcefd319ca7ed20abd5db0eb9c3e645226febfe. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/FR9W12323643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5646988a93d92ae83fa2b2e8b8f1743f91999112a9e40effdbbf64f231179cc0. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/FR9W12319927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3466b95ead2232439505d98e1c272f07cd978b776e7bca6edbd288afbaddf66e. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/FR9W12319928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb099631b1250e79f63463ed1ec433fa47ea07086a8ab8b1e0cab6333f44a4ff0. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/FR9W12319929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9c097c7ae7f1162cd12c772f36db11724a914e7d1c7dfec76a77d141740bdb1. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/FR9W11910960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x552d5692103a58bd15911218a7c619518e210af4f04ea92354aadb9652c83d00. 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/DGA082212647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8200697983b5a8c354a39fc8b370cf47ec67da9112c29212ddbe803085df272. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/FR2X41900922.