David or Dave Williams may refer to: Architects David Williams (Australian architect) (1856–1940), South Australian architect David L. Williams (architect) (1866–1937), American architect David Will
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 0x4a233d6666aa304850822a1f20f559bf71a65bb1ba490a1b36bbf07d503a6281. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1d7cb49f-d1f2-491b-8409-3a77180de23f.json and https://artists.proofprofile.net/proofs/artist/1d7cb49f-d1f2-491b-8409-3a77180de23f.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 0x3b460d79a2261f0a4e84226b10dbd427130dab9177449421f9f335f0f5f26300. 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/FR6V89202297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd12aae3a561c2066139e1b26b72cd8e07a04a5f1f0bcb1fc091376c35a173a21. 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/FR6V89202298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x756877ed0f21c3499dbec436263a37c9df4b6b81887f4b00439b3100db3dc19c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/FR6V89202299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x805addcf7824cf5fa31303066daeae9d96e016ff19b5e1d40ad9496851f876fa. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/FR6V89202300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d5df745cf2627fa0b6bc81588e1fbdeed7644faf9679903cfb7282f7b52e8cd. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/FR6V89202301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11c5dd47b78b5aca7b15a1dee1e2b4265cd83e7f1fd68dc7974b1f74cf85e3b7. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/FR6V89202302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc94d515f2c987771463faecf10abd961341266043c1a9531a935113b5c4490e0. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/FR6V89202303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cefdbce77369f933a1e8ba44f8a5c3e0ec0257274614d6f9a1b83b247310adb. 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/FR6V80044241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34d1243bff3dc2fc3bc9df1de1c6c4921c05385dcc1c5e355302452607bc66fb. 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/FR6V80044242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58ffb10f87cdde72c30f08bdd505919bf978fe014531e492d955033b21e8b97e. 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/FR6V80044243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdec199ac33a909753bafb0d2cb4ef4bbd6b08f2d08c3bc4af47e48f6d98aad5a. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/FR6V80044245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc70e91f5992b36f6cc6d2bde8528033f2b1572083d683139c4c0ee99ac1c1fd. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/FR8GV2259310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32f05a393a8aab5d516c76853903975d8b129328e993ead0b83fde76682761f1. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/FR8GV2259400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70a102ad43a81c319e95c6a633ed933735d4778930bea58eda1d1fc59b659ed0. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/FR8GV2259430.