The vanguard (sometimes abbreviated to van and also called the advance guard) is the leading part of an advancing military formation. It has a number of functions, including seeking out the enemy and
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 0x7695a7214bfdfcdbab7c744e9dc9c5a223b80c0b4fbbb78b6dad3260a587a8f3. 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/155a4f20-1bff-4eb0-8bcd-bf27509d5b8d.json and https://artists.proofprofile.net/proofs/artist/155a4f20-1bff-4eb0-8bcd-bf27509d5b8d.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 0xc4e0e1f68fce55d394740ac61c557e006783314eb9d88bdf6bee76ae00fc54ea. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/DEKV21612419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21caedb7dcc42847d6c9621b71af6af673fb84ba5227b3b57cedc41b0e39361a. 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/DEKV21612372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47e3575a5b8ee275bdaed682a7cd5fc06f4aa698cf0e88731621ed4b16c49728. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/DEKV21800218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2413d082e2bdafe81411824829319e24edd886504bb5b74e849ad359add11c82. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/DEKV21800221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8baee39de84be80d4c7c4512c1f40bdf1f9640492c385552851f46d40738ce2b. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/DEKV21800385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb7555405f07beee948ebf0aaacc3fe874b8113cf362a9117d3acea4e43951e8. 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/DEKV21801326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x843ebad6e064a9ffa716748ceafbb233dce7fce248b9fcd37e9471e0d262853e. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/DEKV21801664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f49e5f10fa6d47cb351d21ae3e28740a864e7e4399ba38a2189f456d3df2e6c. 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/DEKV21801665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe48a9733df5d04b2b1033e9270a6cf409c379e6b9a79700bc0ab08762b652d59. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/DEKV21801666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x862af823d147d11fed1983a80c65c750daf0b7b5921b38470faf0cc097440e15. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/DEKV21801669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x732b1096f0a5424dabec70a26ce981590f32f81962fe28cf3968c4f60e68374a. 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/DEKV21802280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca11335550bebc7e82f29ece88ba61c008af88fc4b59030b0e3ae8f8a41ae25c. 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/DEYX82246613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c2c6004dcf67168b8a4ca308c62c7e0d1a39fde62fb7c8c82b0659a6b2eb2d3. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEMM22000027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa9f83a95a702766822c1c04a850ea06ef71a3160705d7a84fff3fb4a2796ee4. 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/DEBZ71800309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x950031c4d6bc2712a0f25a2954e72b9dbf1f9173f03b94726e6c38534635b868. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/DES131900077.