Smithfield may refer to: Places Australia Electoral district of Smithfield, a former electoral district of the New South Wales Legislative Assembly Smithfield, New South Wales, a suburb of Sydney Sm
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 0xfeb5a1d03b0410116a4cb41748b7665cc54b2cdc14e231100326460ba2a63478. 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/a507a133-439c-44d3-b56a-61b21dcd903c.json and https://artists.proofprofile.net/proofs/artist/a507a133-439c-44d3-b56a-61b21dcd903c.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 0x6dce4e2235a9a99968bdc54885469786d9e5adc19620f9dfb7e7b419bee3113f. 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/TCACJ1593941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedc1f2640ce6dca3c1cd985626b5a0f25420789e26ebdf13d9b408c764c47b5c. 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/TCACJ1593940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79c66740444bebd38f0d48e608cdb4c679c2b9b9ec570288ccc30cce2c8adfef. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/TCACJ1593942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57ad74bfe9205168e6efa93c172ba824c84d02f9ef6eb6d5820d2e6b5a048425. 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/TCAEB1973589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc34344c98d3777854f76a1c5cb3449000b948a9d5d14c2436b5fdbbff58e4b77. Chain 2 (Bitcoin): anchored in block 956425 (2026-07-03T01:28:11Z), 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/TCAEB1973597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x648422a0c96426afa0544aa19bbf66d7237e0a6e49160ef8f7027a20284d54df. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), 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/TCAEB1973606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cf3db7c4421115675ff99f49b96d916c7c28b79b240eb5ec27f8f7264fffab7. 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/TCAEB1973607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc29613de70ed9302deb5b0e78e6f725aeb76f3770fe49707bcb03ef1da08f92. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TCAFO2148907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfb9c4a6612be3ea85e49b456305cd9e98853c0adefa58f609f77d63dc3d784c. 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/TCAFO2148925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dc0678148adb8cf887957c7485852c82c2d8ce2e0fd4cddbaef04dddf2fd591. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/TCAGA2240208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f92a287b1071f2c15f643be4b55402ce95d033f8dcebb408b2180debe6d0e46. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZEQU2245131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x784ad5ab0a745b51abea4506df102bcbf5b2688467a979846c5af879ff5549f0. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QZEQU2268171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b2fa7ad3dbdd7b0efdbd78077f436f786834e58b886d3b80d75e8a9eb655162. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZEQU2301715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa98095a5402616ba78be8ac90e1552508cc726ee877f2c2dc8696215fa90807c. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZEQU2302102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdc0d2d33556d079484b4a53befca36f6f4ba55bfdde6919b2c97bf599263186. 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/QZEQU2400530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0836cdde3e9707b11643a77c835f26a27a73a4d7ae11460355fcc4ee842b9f3. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/QZEQU2400655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe57d5103f4ad62b547348e88267c00d1116d1132d928b0a10954d0607b39c380. 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/QZEQU2400658.