Zach, Zac, or Zachary Williams may refer to: Sportspeople Zac Williams (Australian footballer) (born 1994), Australian rules footballer Zac Williams (cyclist) (born 1995), New Zealand cyclist Zac Wil
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 0x3e843c642ad1308a8816be2a871b8549d7f6dbf1417b47d9f881bcaf8171c325. 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/193d9b3c-2b89-4eed-b4c1-2bc8c3e583af.json and https://artists.proofprofile.net/proofs/artist/193d9b3c-2b89-4eed-b4c1-2bc8c3e583af.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 0x8a4f9c6e5720b482198f1f760c171339a956c9e9cc8388d4cca8f6e2c66204b8. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USUG12203983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d7f89772655f86c8944f8f089a424562c3a02c3009d5b8c1b5082e59925dc54. 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/USA5W2200411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6569f425e12d14059683bd1625ac6174e71ded7fc216793e71b216a88b4eec7b. 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/USA5W2200409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x735b83d3b7ff99ee251faa644126e6b94a3261412db3d9bd1e51d8cb65b2855e. 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/USA5W2200414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ee9c8f94a34dcf1c73e831d685491ccf3a2711d460447f9073502ebbaa2f6e9. 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/USA5W2200423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64a1c1de03f772ab65b632c3ab6f318037e922fe7a5b37eeca8c45d825c86afa. 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/USA5W2200420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2e67a2e2154030b6911a0ee4fab3d7b5a3938778d5e13dda6a7c1e7d841335b. 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/USA5W2200417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ecabf6e0e5b4fc9cd5dbcfeaaffa871edcc3743e9d993a5adfd7647647efbad. 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/USA5W2200410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49cd633ca0524b35119f5e22acdc9c5f9bf695858e7366b7bfd8aab528571d2f. 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/USA5W2200416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91c1231426300891a5fc7a33ec2ae1502ecb8386e8a9f671e01b7b4025d46f31. 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/USA5W2200412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b6c729f2a453adabf8dce890e75ad2bbd5c7fae2f507b136a541da1812b5e03. 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/USA5W2200418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x433bacda535f76eab743e03eddcc860e78e2cc12ab7f1e9cbd3f351706271de3. 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/USA5W2200413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2989e29e411e7d449207134eb35c51deee63f0f8f99980fffa4a2345d7268a44. 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/USA5W2200415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94f23988dd8c5c085bff18bd99cc2951a4329d7cd7631469984a4b60acd3d909. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USA5W2200419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa425e39089e5709a8e8cf6939282405c67d5c2a4b78a8e80f56b38b136106ee1. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USA5W2200425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x003acf2ab298784546a0b52b4f6462d20b2b725a489fbe5b548f67b013000d80. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USA5W2200426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04ca661e752f034966a9ea2237366e7e5d685dc2acc8fe840a0974d032386cc3. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA5W2300961.