Matthew Avery (1834-?) was a state legislator in Alabama. An African American, he represented Perry County, Alabama in the Alabama House of Representatives. He was born in North Carolina. He was a fa
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 0x1d40f89b03ef5743117856b1e14bc73ef887b531fcb7b8147106f14e053f950c. 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/a005c201-e5bf-49ce-b970-208ef932936a.json and https://artists.proofprofile.net/proofs/artist/a005c201-e5bf-49ce-b970-208ef932936a.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 0xcfc2ba6db49f2cef8f79c52e41290992a4e55ad2d7483b8511ac583d2ead262e. 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/QZMER2085006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f0c4487f4c28eb0b771b4ae4d70124702a15696a8bcb56f642950d7e05ba454. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/QZFYZ2134779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b5cf6f8c29380311008d395a8ec6df41999ef3df5e43a1560a085ec0261f7a3. Chain 2 (Bitcoin): anchored in block 960210 (2026-07-30T05:21:45Z), 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/DEPI82422637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8c74b72ae6bda1acfaddb66c2cf3ec9f2892bba79147cded577a25dcdf9a20d. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/AUMEV2438893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04dfa56bb85f194fa278e8ea935b5bb6b2e06369fae68f0a7b5cd8ac85d5afc7. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QZHN92441306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36e32035008c72c96cbdfeb7ddf5be9af50d43914710298c5fd714f5d733e17e. 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/AUMEV2428291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa27d34dfd69e375d09089b5e58417faa4f421e8b4f1f35f37f077753270872bb. 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/AUMEV2409608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63981eab1d1b5a65a349aa0c26cce3637141b0a7d2b0576117518f8896b714e4. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/AUGBT2349308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x353239ec4cbd1bc51a5a700a6c8674219d169353544a2664cfa441130977014c. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/AUGBT2307770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1072e30e1e87441ba10432aa12b0b5b82572b4b79d43b2d456ed60af3cab91b1. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBPS84889784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe8e8a4c082675f45d5ed356478672b49ccd75d48a7451d66a86eff1226a5671. 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/AUMEV2363404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3600ddfb4b10e5572e4f2db19e6bf59387e3b0e70e798a0639219aa15cc7cd6e. 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/QZK6K2349559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23c07ad6e9aef86a13b0da80b3de01206c9c00eee4bb3b02d5fa33efc325ea6f. 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/AUMEV2311692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0685ae26b23a70dc878a800fc35f3d54ad9ed974e6c71bb9c67b9a22015ce34. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/AUMEV2300546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83539d8fa8e67d8bc09d291e610943f60d403d4596465c004e3f3835112c97ae. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/AUGBT2215888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x257966a1338bc6d301aee6369bad68649c933ac61d138acc1e22a46a2df3ba98. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/AUGBT2211467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2adde2bb7e758e3332be2f4399f00393a5c8b44a31097c18187f1fe9043ce8b0. 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/QZES52240543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae3dc7a5228857d9471a1f1253a6dc8b85d7ee14bd168541f87e40b7f794ab1c. 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/GBPS83928195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24fbb21c6f79f5ca76af2d07b90f3a86b9ff7458e7317f39ac1dd1c867fb4163. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZTAU2104498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x542dcc8333c742a5cd8e098d90f9e1c7bd260dae22b6a3cab1f458c9d421bfb5. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QZNWT2164976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec504b71f77e1662c62d15f70d84441fb83ba060b13ef036275efdb0b6583205. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZNWR2102742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b6c62db846b904779380ea70af97c8843147209956f8216c29da76d0a69b18f. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/QZK6F2121723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ff707dfcee47635b0bd7c5890d1191df8ad9a2df601857af9420ad54c146032. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZHNB2191887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ad8ab6dc22855d23fdd6ce9527fecbbee5d787bac9bf5ca7f5deaa6d08a0d90. 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/QZHN92152203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6ed03cd6b0cb76ea25bd91fd4f918d5a3d0de00329acd8c38f63ab3cff733e0. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZHN52147992.