thumb|Kuban Tartary and surroundings around 1700 - Herman Moll thumb|Map of Kuban Oblast in 1900 Kuban (Russian and Ukrainian: Кубань; ; ; ; ; ) is a historical and geographical region in the North C
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 0xb5439f7794791d040d0dd807980e2b58113340f7266a99a92f7172231019af7d. 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/5932e617-7640-4366-a11e-1b06b15ae6a5.json and https://artists.proofprofile.net/proofs/artist/5932e617-7640-4366-a11e-1b06b15ae6a5.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 0x2c35d3c851ba20cc99b67b0afaf44f4face0e5453ef4e8ba10149fffbeaee2da. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLV402301544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bb30d1331b239c7edb09b3e279d4e878f169452c7e89e8f7963a799408e3d9a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLV402301547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5084346fb3a8d428f134d0f8429cdea7380a98580624f17059fb2285133777f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLV402301558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde1e1519f616cd4a3e2821464a356ca019ba41a128a5f94005c712683c8cf627. 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/PLB392400838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81c9795ae21883817cdd8c4f0b5b604a61e034bf7012aad3be00e96eaf235bcd. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLB382400635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73dc2f695fb584173034a5c7e51b6d45922ef198a1bcaa9e74331451b52f4fcf. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLV402502022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d2cfc5d52c1f3cf3c3d1b50adfd434e2381bb86ba26745bd14738fd02b044b5. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLV402401924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x918d0c3b2fc297deeb4d922626322a00f9d25969e987aa86def777e3532b1179. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLV402502011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x426a257aac44a89d0b4c33eace571bdb9a3b27e7c7c7e26d4d14f8fb0d4f89a3. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLV402502023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac13e96ed2de8bdac86a24fa6d35300ff1b65947efe41090433307a011e90b75. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLV402502024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe64d92817f33c5de472961100a4795cfb84ca33e23fe36fc14931db74ae5cb59. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLV402502012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b3f31064e4ef1b9bc139808a17dc7b6767858b44402c3ca7c39fc9821db94f4. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLV402502013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda043f58de1650acc95bbbddaa3d8c21312c7bc53038233b3f4796525d531c56. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLV402501956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb59eeef8ae4bfcfb3b907ff0b89bd68afa224625ba3ab62a816c73e834188688. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLV402502026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc48d783928dc48927247c273076f9e2baf461f7d75b11c1f7cc178237da6a903. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLV402401949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb543fbb5b9825e6fad7680712ef18e0663dcb0abf89376b48bfcf7202fa692d6. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLV402401940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33ace1e78e26b3b0b8c190deb5284dc1b3ceadeaa65b819a2dbee8a16a02f557. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLV402502016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a1da0f6836ea3e30ded7340e7935f0ff7e40da62e8ba67cb4e286a51e58847b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLB382400540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafe9b3c96ea5e03c05982c1a7556e02fdda43c5b75c8ef2763a2076ca9908737. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLV402502029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xced2449064ca66e318463243169afae9f43ac33770dc694a9d32048ae73dd995. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLV402401912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3247969a99a5625a88f47d4b9ada6119e0e7d9ec2d0c560e0172ed1712a4bc75. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLV402401884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dea1abfb4e68a878e5f79c81833e67758c1459091f536cc8b58c584b750a2c9. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLV402502030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd90fb41db94ba32c2e875e8927c8851afef22caa135f51589e9c42e2eae9158a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLV402502031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a236bd6047b9696df07ff7aa77b23e3b286b86cfce1e757df689fc78b92481c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLV402502019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76fbe38c0bac52428eec5d3692be0eb404e3fb068a35e3c69546ec1c4131ce68. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLV402502032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdcc84b27c03e1c3855937bb385d4389bf7c8713823f93eb614092faefeed5bb. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLV402502020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86dd75f1ea7f933743ae50f26a193007e321ef39769796bbee9f83fc1c67a005. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLV402502021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbeb135ef2245735b08f9adbc5684d16d126da628e4b93f2655bef4f531f0cb5. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLI292400871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1aaa7b3b52fe3579cd357c836816637e157c9b37db498e3e92d4183fe33ad3c. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/PLH181800609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b9a4b5dfa2123447f82414d384eb39d3fc9f2a3f4e59c644c5e3a86dde12300. 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/PLC071505017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0db083f78f5200301fb2d613e1629d7e73513136900f7b1ee3bfc3a082adb7d. 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/PLH181600648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ab7b981a911ff81a3abc11773d6aa11ea8f3238fabe81f5c1db9659d4b1f1a5. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLF241401599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x858390cdd063505426c3e72e3adc7bcb0652f731856b9112df92bc1a7eaf1401. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/PL2DY2300849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35c2459220131079f1f6f618785b330a85ebfece5586ef88dd9e4620b22d4574. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/PLD111400032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x706ada676c23951910ca6e10f892abc511dcee0ef31a1c4ae047a8eef8d6bac6. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCACQ1664076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c8fafb112ae18d0a9b0a41b07b27944650a423612b9e4cd0eedc8690b43e625. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLB382400201.