Uman (, , , ) is a city in Cherkasy Oblast, central Ukraine. It is located to the east of Vinnytsia. Located in the east of the historical region of Podolia, the city rests on the banks of the Umanka
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 0xfacd08b5ac429be20c5b2e7de76f37a37f21357ad166555e1a9a80091c6cccff. 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/5fabc28c-ff34-46a5-85e5-7ae1e6456ef1.json and https://artists.proofprofile.net/proofs/artist/5fabc28c-ff34-46a5-85e5-7ae1e6456ef1.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 0x002ce41aa77ad7c87ddc4c48738cdd9475b07349a992013870b1f0ea6448cc82. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/FR6V80854273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd56c5a219b982eb1e4529bec26465ac1b9b24f2e8dd107ae188424007606717. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BE1GH1700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dd8084aa34896b6cd0712f958cb0a315bbe4adabb0751b861ec444ef0c7f2d9. 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/BE1GH1700002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaeebc868fd2172492ddfe894beb3c97ff0e29aac18d28d23a290f192f73a5c4. 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/BE1GH1700003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0c1c0fa5ec1bec2560dc1b6620c02f9fdea9d3417238232196b1daf904c1999. 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/BE1GH1700004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9972d08e85942bc3005e299648c5656df6082b623346d071e9f33b58a1b2a63. 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/BE1GH1700005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x134c2560104dc7cdced3b3fea7cb97b6ae828c124500d1c999946d0baffe7159. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/BE1GH1700006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a3c9e3a702546509158fa84ada7ca34cc6032aad37a8cc1516687dc50ef96b5. 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/BE1GH1700007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf53f129d5188bb088aa26ee9f0be6fa3944042bfacfd2f77292ae23c5e495fe5. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/BE1GH1700008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x672256fcf732516d1f0171122c55af6d791b6ac735d0ba90ad142435bd4e990b. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/BE1GH1700009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fbd7e3c7dd15dc62b7447fce7ef913aa8b470b31a03cea9fdc9b415f4579885. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/BE1GH1700010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1df8fde4ec679b51817e481e540bb6a9e791f330a7288a3c00ca784e834bb087. 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/BE1GH1700011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb41696e9003fffc41672667613a740bfec234fa5c0473636a57fc98babeda14. 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/BE1GH1700012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06d1989956870d91edd114e4d19372bd8286c524ae270ca45a4dea4496849597. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USCGH2387967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d5a7007e36a689f1ecf9ae1fb580138ab53173634e95dd2f9f1cdfeadf23a3a. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/USL4Q2321006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39067c87c11ea295a62ba6921bd31ecc9034d7a37aee8aae203093c1de289726. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/BE1GH2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa831e5693f1a35794a30c321cb0f48bb24688c039be04290f9016c794527b0d6. 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/BEJO92000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40b753db74ef4feac949803bcf4478aacb3dd27eff4d0e593a0ff51e4292161c. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/BEL231400016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b09d61920a4102a9b0e93a78a53ac5152ab332ec80d86e88661136cae38e710. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/FR9W12039105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9fe40be6dec2a554ab54551c10a0fb53c98c2869366823ab8c940093592bdae. 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/FR9W12039112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe588fac807f429220b82131bb65ddac243dbb4f7eb6054883890c284a8d2face. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/FR9W12128849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20181a72da32472c6b90a7786b931db40496ca48e4a4cfa0cb134c06059fdd77. 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/FR9W12111771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf59b5d02d0c39e58911c8ae01b0840c81cd1d885f8ea4c73ee17ce896b310682. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/FR9W12145310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe01aab516dc1cc9dc33dca57c34ed39e27a86d5210fb54c0cbc7665d54be8967. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/FR9W12021829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66c075ca483236ac5e8a8d60e85b2176248ae1885fd1c4e261515363e9e46145. 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/FR9W12128848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f7a7868ed13438c04d8b08f3086dc07d0d57194ab033797640f7d3b95d67b6. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/FR9W12141748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0125ebb53147ea634a3a2ee613c4facba763ee7eb482879e403c30339806f0cf. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/FR9W12119579.