Katarzia (born 9 February 1989) is a Slovak artist, singer-songwriter and producer. Her song "Kde sa slzy berú" was named best single of 2017 at the Radio Head Awards. Her songwriting has also been re
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 0x67bce28d7050dfb9c4165420f2d87f58623c6ed8ea673a28a347a150b9a1c278. 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/39865f91-18bd-4384-974a-0121782d8347.json and https://artists.proofprofile.net/proofs/artist/39865f91-18bd-4384-974a-0121782d8347.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 0x18bb081ca9fad89abea283a4fbd133b623b30bfa0c1893d49602f0df8d9edad8. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/SKE011306009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a242395ee9afce649412ff8f5d3e3ab3905fea7723755d8fd45b65c9be9a8ff. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/SKE011608502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd507a588524ad0bf4299596f5dfb8908f33713518edeacd0b7f864bfdbcec533. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/SKE011608504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf61a0b0e8b2a7bbd3acdbc82d9d4bddb0e4f20506dc909f7f987fbc922bc254. 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/SKE011608505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02e74eef0ebfd3bb118be6bbc0d79af1a660a4df0565bc1fec984385b44c4329. 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/SKE011608508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x566b01e7840c2e8c601f9d688b8843c918a34a151089b637cc959baa97446048. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/SKE011608509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f8a00004016fde40654622ea946cb6ed7fc9cead085a1843da36201f46b36b9. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/SKE011608510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23105fc638e8c15804193c8785da1d1037401258bc2c37116ea3f4db3ece7bca. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/SKE011608511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbad5fd1be89e219455cf3cab355704b080ef1a42486035ce2132bfcd8d22beef. 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/SKE011608512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaec671bf9abd986d209e9379606dae58e97a4bbcb7edd5a5ebb3232ef25c897e. 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/USHM91793319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78d40f1964679f1f7a3ba14c468853ebe97d8879f19123b8a514a391296dc852. 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/USHM21989642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e1377ea126f2a2dcc264668607148ab3cf53bf46cfb95d40d05eaac1c71b7a0. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/SKE011810505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2c38f9f1a4d6302afb511e01a4b3974de675801ce9330634f4733481ad88de4. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/SKE012012202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38e7099aa524b55cb9ee3aa3990e10a27d0ae1ded4ab212081c50e0f347f1140. 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/SKE012012204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23d0edb1f7355319c5f37298a20f292da1043e03e0b3894d83161712911a7485. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/SKE012012206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe43c21a02b2ac08e55e21d60431604b8de9fc6436a81d58c8c474cad8a28c3ce. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/SKE012012207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x676234fc428f5fd15d044954df0a2f11b0f7955f46f3c1b70c85d2f2de69eb40. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/SKE012012209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ef08ca0ecf2601ba77969850ec9711636d7dbe9f2cebe34149404effa965d39. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/SKE012012210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea019dda85fab141c60680be98411ac0f824dbc9255e8285f2ad939d462ce346. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/SKE012114304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x803d9271320af7adabb1d673e4aca2b4f1a3a465e465fc627795e77da4b51d6e. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/SKE012114306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91b966d376b2bb4058abf08c37cb322c2240b59b033a7e820c371039b08abb46. 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/SKE012114307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeece14eb1e9f2e87f59ca0323cbef0a8e57d2945fd2fd0454d4fbec7f891c89. 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/SKE012114309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9cc3e577af3e368174415fe4d76219a6b21f88a1743e620bb7f695dd5503e71. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/CZB872310004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98387e9284d1a374a088d575374238831fa293ab03255c25f2c5b617fcecf108. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/CZB872310008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fde1748789d8578e67089adcdf3585f8119e6d86fe01a5464cba5a62973bd6e. 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/CZB872310009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1acf445bccb57c0ed5f11d26985f6f9be8ff09bdef9c56ac421ddffc16533d50. 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/CZB872310011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a42a20dc06246208902d1485e5b36d33239b8ecd802c1cd74c55d4370db5ea8. 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/SKA012300182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x368d0da4521cbd917d8c1249fc93689c18543a091d1bdf1bc98c4ac5a4899c87. 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/CZH112300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf184045102f5cc4ba9f31912a83013a05b4c42fa4755c77a78c1c7054626fc5. 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/USJ3V1457033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8acd20104440ad1cc98572675861feb111e32e5fa95dbfabe402f4dbe954073e. 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/CZF011600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87440270be1dd2414f0cd31dcdc027da3d9322d76195e0ee5b8f7774b1b6b051. 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/QZN882525496.
SLOVO (Hudba k filmu Beaty Parkanové "Slovo")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58a5ac3ea859d2fcda8e1e9ed02e44a368356006f642b779ce98c5a5b5511280. 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/CZA162200851.