Undervud (, Russian spelling of Underwood) is a Russian and Ukrainian musical group (alternative rock, indie rock style) established by Maksim Kucherenko (Максим Кучеренко) and Vladimir Tkachenko (Вла
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd73893f7c56045169e74e7f91980ae46832fd9bdb7a99a79589ae499468b64f. 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/8970dc02-c32f-4d18-b698-ec2aca5b69c9.json and https://artists.proofprofile.net/proofs/artist/8970dc02-c32f-4d18-b698-ec2aca5b69c9.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcc66097eb5ee01671b31e1df4324fbf4ce6fbd57837b3fc6173cf19ccf5520c. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QMFMF1352734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f24dd5498fddba4fbffb6ea08c5ebc3e256efab00fbda07e27e86a92bec0d33. Chain 2 (Bitcoin): anchored in block 957709 (2026-07-12T13:52:43Z), 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/QMFMF1352736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefec559c533388e7a47b95d82fa470e8335b4e96fa1cd2e2f743bd10b4c2c9d7. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/RUB731417398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84415bebefe37114bdfea93368b5da9a4833af05082019bade4c2d2fd8264c49. 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/RUB731417399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a5b75c82983f23d15de76322a09759948fec8f9b6c0626bfe956b6b369110dd. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/RUB731417404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x106839d7311eb7b028ec87d381274a873dadff736e8852826aeab6095d83046a. 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/QMBZ91966122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf04eddd7c9917ca55ad611f99fcc6aac94deda4a6bf163c33d37fa32a1d527c. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QMBZ91966069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58dcfb3ce826b89bd4f4da14df21ca80a8d5abe07292dddfec93f45b22eb706d. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QMBZ91966071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f53eccd0e154bd7482346fd3cbbd7eeed8952ba495678b603e991c198eb6e78. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QMBZ91966040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6025a2b908c50fb8d4b4fa3e4e23b75bb0016231ec783fa8522c231f373111a1. 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/RUB311502402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0413a72faf0158bf033cbc6156b2ed338829b80c210f7c5c2f126d72ecb2231. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/QMBZ91965885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b7a2db8cc6e1c8be15aab940352a725cd1a1fce8d83dde803e92431c5895bf6. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QMBZ91965887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f3dbea9a6d9940842041b2168cc309c0e13fc74ef34eded38c8b5097787862. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T03:32:36Z), 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/QMBZ91965891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3908b793793c2f2d5f9550150970507b98f96bee90c94299ca68d1fcc1c55876. Chain 2 (Bitcoin): anchored in block 957709 (2026-07-12T13:52:43Z), 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/QMBZ91966186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50ef67085912b1a35cfe89d2114639fb2da46d8b42614450b6150ab93ee66638. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QM7281956898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x334c5fe02d212e6ae4b42e598467de0daad2fb0723db71ad22ba81a1b3aec115. 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/QZW9L2208715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06f86809dbf7ad84769c5d8729a57760ada541990ef0bd8e0520ddbec800b53a. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZGLM2480992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x606f549d8be27e404fd022b7cea00bdade1cfc90a1c8ddc53c7f7d69a4ec21e7. Chain 2 (Bitcoin): anchored in block 958798 (2026-07-20T02:20:42Z), 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/QZW9M2411562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf7b5e83475a7e55bc8df752c41190b7d2bec045c018999ac8dd4828fc09708c. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZNJW2512359.