Matilda or Mathilda may refer to: Animals Matilda (chicken) (1990–2006), World's Oldest Living Chicken record holder Mathilda (gastropod), a genus of gastropods in the family Mathildidae Matilda (
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 0xa2da4640080c00121058268ec11e01af76154a59e0dcaddf9120a70c42fccfdc. Chain 2 (Bitcoin): anchored in block 953724 (2026-06-15T01:43:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8b27e3ce-6304-4ae3-b276-c25817f0dcd0.json and https://artists.proofprofile.net/proofs/artist/8b27e3ce-6304-4ae3-b276-c25817f0dcd0.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 0x688835c5a2c657ffb66ca09f54839935dab22aa3e952c682568cfeda7f7d911a. 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/AR7YY0500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d48e344922f823ebd52cafe9d9d21be2b395b80c7e99c5362e2c4bda184ca8b. 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/AR7YY0500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9403d11e52ab6dc48c82f9b5ff8cb4cd82e9d78b23075e5106415061cdf67a35. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/AR7YY0500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca607b728ddfa22cbeabf4a29906c88145948879187856b6ba268e89d1bcc44e. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/AR7YY0500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac2f0db29ef2a18e20238c62f3908c9f612de94158edcfbe92346e8c065c63f5. 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/AR7YY0500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb227b0cfdcc22df628d871fc7e9a17af6777df45755623e60504b4a2d807412d. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/AR7YY1600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79e4489de2f5449fdf8fe7eef386b25003498f7387fe67c5386bb5c7c6cf2082. 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/AR7YY1600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77a8549d999448e25a077072786eafdc57cab0170ffb8bed8d7deb3651626b75. 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/AR7YY1600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c7316159a565bb09c003464c51afd4ececec9096e0192dc766fe43b43e87f0a. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/AR7YY1600005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7634293d5cc78a05cca01c11b720d60ce6cd392fa41f2a959cef041c6173d4ea. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/AR7YY1900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a672951da0120d04404bcd3def2360551b8774282af68d01b6df6aa8e794ac0. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/AR7YY1900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76d5c78733d7ea9e6b27f11e7beba715b67528077e5a60908e29dd833e12cca1. 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/AR7YY2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe42f8266683d08e3b5067b0356856fe833449f0cf5b246e97bf04739cf2bc8e0. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/AR7YY2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x029c69e05a59173fa40a367e0534c45f23ddad9fb33232ab5bc40d39fd78c2a8. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/AR7YY2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf025f4f4389b9e1a406cfb6647abb3dac6b6572d577d3b08a2c5f732ef7fae3a. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZMZ92021253.