Slobodna Europa (Slovak: 'Free Europe') may refer to: Radio Free Europe/Radio Liberty, a US-sponsored radio station Slobodná Európa, a Slovak punk-rock group formed in 1990
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 0x364175e6ee56c0a4750b8476d5c77227f1c7f1b774a4057797cd872d00c19d45. 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/143b6b70-6b9c-4d3d-8a0b-db691d150ec0.json and https://artists.proofprofile.net/proofs/artist/143b6b70-6b9c-4d3d-8a0b-db691d150ec0.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 0xcbfce788f8f1f279817ceab206716ac6370409c12f66a36990b87e7cad93291e. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/SKA129135202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9c836d9edb18ce22edb1b4cd9c82bdb944326682a17135b42535220df36a9f7. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/SKA129135204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8915d38e1e3b03cd62780596e0c0409b1ccbdf380b218a9add7f1312b3591ec2. 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/SKA129135209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7227d2395626ead2b525248ecd296e5a72d27e04100c97641f29c3e4f41c6cf8. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/SKA129135210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9051a143933e6cbc6921a77d56139455e8fc9ade8ebe59f6e6fbcdce322557e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/SKA129135211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ef0ccf372bee16b4fb2a9f74eb1cf1336d2cf59efa729f478a1298e221860b4. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/SKA129135212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98eee5615eeba98fd0a835ddcf57a0003d82e969626cbce4f5bb52a3f251c0a2. 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/SKA129135213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8259073a4d297e43faa5953f4618b89ac6f0d94b9d30af4a2dd53eb95e826c2. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/SKA129135214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x142eb89dc4890f7ea12ce4203fa49437f62403a03fc38f377429951cfc877df6. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T13:04:09Z), 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/SKA129135215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdca6076072e802f5cfea54c35128c1ff2a9afe32aadef7e015802999d889e86d. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/SKA129135216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf8da4fab25e15952df93c6c6c7ccf1a55ac72885ee08c7462833e29aa4bc13e. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/SKA010305301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b6445e981d8781aed583f7400189c20678e359699602551478ead9e811f81cd. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/SKA010305302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b7e0ca144b24494c119505e89b2254b85fb2512ee3a3b669dea6737a8cc825e. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/SKA010305305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e080ff5178d1385fdf7ba02476cf7a51cc714f159c5d7ca28bbc5a74d5a9642. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/SKA010305308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e09d5660d13827e7a5da918ac5d7271c09817f382401c798358001cf35e566e. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/SKA010305309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3a00825dbd530b3b7efcd1f59901c4092cc358ddf52c03841a6b700aa5c95be. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/SKA010305310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4415abeac420afbc0d16b277de686aeb581ce4f6098e189b79b5a2539e2b70d7. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/SKA010305312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85b36503f4bf227aab3d1cb2c10a009f2c6c5ac773273000c5882b07460d6baa. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/CZA231400040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fcfe081263e27d470fb15a5c71663832919e40b37231d676ee47d008713e619. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/CZA231400041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa05dcbbe10f81bf757d3795294d7b7f2f3b6e4a78c6aa042bd7526afa8579921. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/CZA231400042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ce88fb672248fdb556cd2c8665d34d38f841dc2d90f4bd5ea02d5962c99ae71. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/CZA231400043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b86644b005af4aadae95b35ec6658e3abaf96cebac08641b9dcca94586841f6. 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/CZA231400044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca1295c12d9cb6c8735b5ace3b73ad81b55145ca5c1d1f8b0b606369c5ed1486. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/CZA231400047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe563811259f6ba1f8e44b4a10bee878f08a3e761329fe99f40dc379d216a7463. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/CZA231400048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c41337d6adb8f3660513181e942c222b420b4cd07df76d5c5816c090780d882. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/CZA231400049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4411d0d35046ffd546ee336426258b7565e32df20b8e65091cfe57ee67b4fa67. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/CZA231400050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f5fe1b63a48c994a3cd7dc4ba0681617d8501b0d2b86596a1ecb8da02d2d222. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/CZA231400051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca6c44a7d2778f2a28cb184e83b29e62790e2e79224ef495eb87ff8387bde1d6. 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/CZA231200362.