thumb|250px|Four aces from a standard 52-card deck An ace is a playing card, die or domino with a single pip. In the standard French deck, an ace has a single suit symbol (a heart, diamond, spade, or
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 0xd701bc6bf1a202310bf3ae6369c64ef28cb35b62953fd9d3584f7de15e064325. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e73622e8-7999-43c5-ad75-056df957e1be.json and https://artists.proofprofile.net/proofs/artist/e73622e8-7999-43c5-ad75-056df957e1be.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 0xfc413192add005706722822e4c79a191966fff02f69d9b5a627fa4f2d510b911. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/TCAHD2322393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0de6f85f93e5cd8fb4fbd4a505cde51a112ea6465a4ee9f19e639b21b97f43ce. 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/TCAHD2322436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60c3a07077931557e9503bc3174a21860d1c420d6e99f8ed8cf5b90b7eb0020a. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T13:38:16Z), 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/TCAHD2328282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b6dd7949df08f4fc6ff49c3eb8ef4006801ecbda35726c0e98414637ccc55e3. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T08:01:17Z), 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/TCAHD2322497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x367b2fdbdc020942852b0b467820c94a408920e8018e9fc7100d30d49344c3aa. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/TCAHD2328196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e40e9882476a7684a7710971b4d308f006d502d59c0501e61d4a29166cf8876. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/TCAGT2362846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x813c1f0e672b511678ad65d92fb9b03d6cd31e1e37b5f9e6919d224cdbba0635. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/TCAHC2392578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd54cdea3b63edd36dbf5bb7c5d5801ab0f99288544d18c9fcc4be74d35890de4. 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/TCAHE2367265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb88b8eee2a5f7d012ed1fa8835d0aedd5df23a066ccdd3f76ba8ac28f2ebdd07. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/TCAHO2362313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13de6279959ec915c9c757e6e42a63dd6c25c20274b52e8325cddac87d5b0dfa. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-22T00:41:14Z), 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/TCAHW2471971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecdaa3da47ab4dfe7e412c6e89e283c01fc322f80a07d20de0e4cf30a581f9b1. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/TCAIJ2445471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05502ca3a1fb202ff01a1e3ade4da20b1d71948ce2a8a4ad04508a532ad4c953. 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/TCAIO2496648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf0cd6f7b9e325505263f06f81a6b5bfccaa168e61a2e3cede24bfb20d2dd708. 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/TCAIP2454881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6f50dc7e9d250cb4efdd3345a126e8a01724043a20b3a6a82c3b2305c1a1881. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/TCAIY2463267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5017e3c340369290c6c650215197acfebe3c8f5cd66d0eed42408415d30fd6d. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TCAIY2499338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbad87cad8a81a1545a900d935c42f71bb28642d9fe06e55f49743874df7fb38c. 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/TCAJA2456488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49f0692e4fe24a7e1eb9c402307e3eeaf05801b1f028b7e3a38c0d2ad8a58abe. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TCAJB2431238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3728b863192715af844f8373b35112bd643fabb19858a1206c0cc32f4699825e. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/TCAJF2516707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb734c1c77e727569526ada3d2f1fef427846fd958214af5f164a4fe3db897b7. Chain 2 (Bitcoin): anchored in block 957526 (2026-07-11T06:03:28Z), 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/TCAJG2515914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c4b58469363111a4c67f0083b2bbc5e3ad16d657a3cb84910aca5b2f6110922. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/TCAJK2505326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x932168be29a88e8f13bf88f395b1c8ae3688875e9b2d91bbde08f4ef940aba51. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:25:51Z), 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/TCAJK2521306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97adb504ab24119eae2cbe62bbe72709c1134ef808fd56a966cf910f62e70346. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/TCAJL2592436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x819001d2eefadcaf88cdf2eccc1dbebfe2d1f2ae6c0f0fa28aa2dde1411cb756. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/TCAJM2588199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1af8f75f67532d5acff5c530e5863649b3fc2814d163f125d629293f3c030be. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/TCAJN2551644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d4da3608eb41bb887e11c506f6889bd475860287b6c6349509d1caf5bb75dbf. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/TCAJO2517117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14cc36b4c3245b91f44d41076a6244e781ee9ccebb07ee5ebfdce6f609a1dda2. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/TCAJR2591844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4329b6c05b0de490f11cdd85155c0be23adaeb942812c747b35ab04ed7214034. 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/TCAJU2509626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x051ba2c6d3281903f66f1c8a7bc73103500bee9ceb5ec898fc2565f248649f11. 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/TCAJT2580467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0393beeb403f7601dfe84c0ff8dcb6f0231a47b92726002242b134dcd5bf7a03. 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/TCAJU2596872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfbe679230afdfd8b58476f23360564db8ba627782082e3c5e1f91aed308fa6b. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T15:00:58Z), 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/TCAJW2573983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9613201db9dd3d0f37e646de38ed561b27bc3b0da7a0513952aad93bcb93d861. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T22:51:06Z), 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/TCAJZ2547221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6887052f2000980232ee4f505654dac6fcc7fac75990ef3c6f06ad795755f6bb. 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/QT65X2510320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73e339ab0d42f1022a4ad152988703a50b11476c50eae79224e2f6d6441665e1. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QT65X2568416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79b61cebf2d09c497bc0afa6728609dd0e688ab92d8b984d08d3ac25da0c7fd8. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T15:40:00Z), 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/QT65Y2550764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x244e3f5ff414775b72609ed4fb92e331dac82b96ba7f9098b2b9c4735bab1dc3. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T16:25:02Z), 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/QT6622540908.