Kastro may refer to : Places Kastro, a town in the municipality of Kastro-Kyllini in Greece Kastro, Thasos, a small village on the island of Thasos in Greece (Vryo)Kastro, presumed (pre)historic
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 0xaf54bb2d2b71b78aac1c73f8493068e33c45d089f7f6d3043b7ed5dfb66f7911. 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/516dd7cb-dc35-4591-9ce4-8033a80ba84a.json and https://artists.proofprofile.net/proofs/artist/516dd7cb-dc35-4591-9ce4-8033a80ba84a.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 0x6055ab305b4082f29c9e53175f724b24f462289192e31f0e72fdc9f7096339a6. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/GBSMU6862728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6df638734c446b0bce788150303eeb1f059e277785507fc85e1c7cebf753ba3. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T21:54:58Z), 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/GBSMU6345624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa81e3944f9ef95f0ae2c909190a31a8ac979a6f89b1e5af2b7b134b63b06dc5a. 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/GBSMU6596705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78bbd53657011cdd7be0914433415e5dde7bbf0ed1c45ee453b9cfd4dbe684ff. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/GBSMU7549650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa785eb37cfe9af2ab4ff9141323c80a22d3c67aadcb991edf8f5a56df1bd2fc6. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T15:29:56Z), 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/GBSMU7935203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc16b9fee2261c782cd41fc5f985c5a0487633cece9cb138a2938fcbc6d9c24bb. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:17:59Z), 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/GBSMU8567415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x782839158aa2e38759dae5995b9b34a2b900feaffa7aa3e577c68961ddea5127. 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/GBSMU8796727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf896ee565c99eec2a386e88abb445ac0692a0b11ab4d3ccd04e4eaf3d4e275b6. 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/TCAFG2081270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1386e34f2e121246f182fb5b16f1b92a09d96cd9944a213bb6692e60fa1da26. 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/TCAFY2123864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccb941a258e874b0a771b3b1b2ca79d2fb1d6329769446d8717cb43fc0ecd792. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/TCAHQ2322281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6938afc0950c226017ced7e4a94431fece84f2f0792065712988135e1be7321e. 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/TCAIM2488723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9275f660c26015e7afc8c203cb187d4e6aeb9efeaf54c77b1d9c2592f516efeb. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/TCAJB2444959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x561f466a22a1bc57604f06ad14c8c3d13c0a12def07b382c31c9610ddeed7d59. 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/TCAJB2444969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35c65253b5bbc9c7a2e372963f3dd96b2cd69c82c47ad6a44a5cdb3e664f6406. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T16:44:40Z), 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/TCAJB2444978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4935eae9563bc4a72f8cf6e02e00927bfb546e2de22b07ca3b505dae8d12b736. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/TCAJB2444995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe10814c61ebb8c4107fe287623f18a0a478b44aa3c71108df193dd2b1b229ee2. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/TCAJB2445026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9447f42cf85ff15947321c656e49dbd929ac566d56907e2a8780419485ec18d6. 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/TCAJB2445043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97ce5e4f4336a0f8f5c3a05505f0e46c27464a1946f34bf961b899c1cdd13381. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T16:10:54Z), 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/TCAJB2445061.