Karasu, Kara-su, Kara su or Qarasu (lit. 'black water/river' in Turkic languages) may refer to: Rivers The Balkans A former name of the Struma River (Struma Karasu) in Bulgaria and Thrace, northern
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 0x0f86a7e7546f366d8a7b3f0e05dc730f7ea10b1d693a7d72363e72ed96eff2a7. Chain 2 (Bitcoin): anchored in block 953641 (2026-06-14T13:54:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3c7e0561-2bde-4aa4-92ed-2650309883fe.json and https://artists.proofprofile.net/proofs/artist/3c7e0561-2bde-4aa4-92ed-2650309883fe.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 0xe19b5dfa0c820e0be88ff2186550b332b31ded584bb0b913eba264d69d5c3605. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/TCJPZ2430749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73a0a6d48e0681b82f5d6c1358fb47aee9e316d58baecb3c23d33b8499a94833. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/TCJPZ2430750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5946629a62be53b648d714a131416f7f80d496c20f36ce2cb2159e1ccef8822f. 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/TCJPZ2430751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbff7e5a90f9f5ed2508ff1cb8620228b3cb838cc5f9272bf79187b9384bd6e0d. 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/TCJPZ2430754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36a1be46731cdb7a91f8163f75c7ea3ce4062570ab2921881acc47509d4aff05. 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/TCJPZ2430763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99e30b1c6fe235a2179c40ed252ae2a968d2d361ae21f9e178d423c4d62cb10a. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/TCJPZ2430768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab7b725dbc509085703d3da522c6e46dbca25a732487b57af2c1e07c8a4731d2. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/TCJPZ2430774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb870eb0cb5021d82b0ab9e16b730d03a9a0ecca320c0163054a28c246c3b352. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/TCJPZ2430739.
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 0xc4d095b2d3fe8ad672cc8f6bf5dc23697a7fe9c191d485398612ae8e978d6474. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/TCJPZ2430745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92a5cd3614fea9f1432a748595105382004c2ab3b6da32f9174e240e2b1c964. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/TCJPZ2430757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf580fc714d17cfd2b34a3b9422f65fb82acf63db0eb2e710abe1bafef1c171d2. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/TCJPZ2430760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a9b555ceb5e8c2275a6c50eace11edf6e83edbb105f648339d91a615e8cc3b4. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/TCJPZ2430766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa11678956a974745b8bc745e38a42a47977c984a79819cba53f1176ff9c90dac. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/TCJPZ2430772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17b6ba2a57c3ce93d6729a4737a3d3bfd19da7f9ea2e1427587eeb678d74821d. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/TCJPZ2430775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd43900b7f808143559182a9486b4661c86cc5c84774fa8d535521269ce8d380c. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/TCJPZ2430778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec4512dc68e061ce5aed6439bc005e3b4f689160718833a1bb04b4678cf28d39. 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/TCJPW2360837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x011d481e51cf96d2b90b2dca0d35aa525a5070c39a37783c87d091f474bafa58. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/TCJPU2206145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x422df806d118cb4df9a19fd3407a5f2caede9ad36ff3c6e22f3c5287871c9793. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/TCJPU2206154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2eb067e111215f9c90a8894d308a76674f3f204f353de519cd90c31cbb261c4. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/TCJPU2206143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7af9622f9fa6c6f27fa17cafac645adea9012c25b4446e960deb0f73441056a5. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/TCJPU2206153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5ea33bb14a992473fd265db6af5e280fe76f7d2949bd530516885b34d1b6a46. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/TCJPT2266160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1deac0b017a284d675916b35b2afdca0a3f0d10913a505c9c4b8addf6afdcdc7. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/TCJPQ2172873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x095e9873e0d63c5496023a3bc1462c727448ac20c4608dd67da27a3a045a73cf. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/TCJPQ2141454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f054741ce5535b801cf1b7e2fcf71d8072b2d983dd2c7dd88276a66ceba1b91. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/TCJPS2220799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f49edde7d5790e0c85dbe4cd1fc97a7b9a0b165be7a34f687c9f2e0b7bca06f. 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/TCJPS2220804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x050f89cf4207a5e9915b118caaee91a2f150225f3782faacd26dab305ca224ff. 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/TCJPM2025525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x846002234f2daaade08a98e2fd5bb1edcdab920930a2bf94724a05ee9d1653ea. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/TCJPM2025526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb46c57dfa003accd5ec21ff858b211ec896189fc35d510b14c9e0a98b086544e. 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/TCJPM2025527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7be8c3d27d069f5d90c483564fa205d01355fd1d88bde242a01a2dc3ed74805. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/TCJPM2025530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a10684bf3a92f895142078fdbf023d38a1bb31e8f3064e225be3b2aa2e51a75. 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/TCJPM2025528.