Kartal () is a municipality and district of Istanbul Province, Turkey.Büyükşehir İlçe Belediyesi , Turkey Civil Administration Departments Inventory. Retrieved 12 July 2023. Its area is 38 km2, and it
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 0xfcab1d03508e1f3402bc47c9e082e09754473ae0350fbcd80f2f7ad9e887ec32. 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/a8a8e78b-78c0-4dea-a4be-26b648000dda.json and https://artists.proofprofile.net/proofs/artist/a8a8e78b-78c0-4dea-a4be-26b648000dda.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 0xbc7d1c69b6f915152476575caa02d1a112576b9162991c1f94a1fc923003cf04. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CH7812417603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcde853894165e0b5012240b5b9ce89acfc1de50801b13f04a8d1cb9fdb30efcd. 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/DEE862302153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb29e6e899d4214c267f8486dcab6d815a7483747e0406ac5abd4c68ec36fed95. 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/DEE862301629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb29e6e899d4214c267f8486dcab6d815a7483747e0406ac5abd4c68ec36fed95. 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/DEE862301629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc4b4594c186c5fb0a11a284e47d3e051be87b99ac3675b9f1f7994a05ca9989. 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/TCAHD2398943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8ffd9ebbce04e6935682e44e7acd3c315cde4b5399ff8d48d5a704a0105c77e. 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/CH7812348779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7394c6304b3076cb41ff7a00608b96f3a95a1be985f3a2be3d33a4695bf03b3. 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/CH7812346420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba40750d5bb06c1660712c2f395b93a8069e9ad8c05d05b89e5b56192d59596d. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CH7812343096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d84e0c0d79509ac800bc079eec46190f9f485e0269111f66dafbb61dbac3abb. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/CH7812239088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3274f5ba1b7ad91f01d3230fbf7714c5cf0adfe60a43d01db722d8eff268113b. 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/CH7812235215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9465cd432eac44c9c2475776535a76b524b49220840c01eebc4920a93ffea2cf. 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/CH7812232117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e505d269db6e6cf059dbe122b9b92da3fa148e6966552b00c32e51c71d8397e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CH7812223234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x043281f5a8d57894c249a9397449643767ee4590de8a6e16f319bc06485cb6cf. 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/CH7812220532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b03bbf1fd35f5fb2e74faaabdbf1665acc098842b0a070d5f26390343e3a5bc. 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/CH7812218377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaac662f1def7bbb342102d40dea38f3294e9af0aa966a606952f75c8d75aef2f. 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/CH7812223247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c059d64a541a62616ed72d1725dc07965965c6ccc8805fdeb0e7b365a9f4402. 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/CH7812110213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4ac4f2405a78d3743fa17950e681193dcecfb9e35f3de7c559ecec03075ed76. 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/QZ93L2135313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd092f8b77c7345e72b476acc888d337fff59986dd0b61cd91aa91173aa98acf3. 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/QZ93L2132613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x261436b3811d58ee057e7bef1b0b8aa58f3958de405e23d7b21ea9bec443aeda. 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/QZ93L2128112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb517b1da51400597d561880c2d7513fa10327f668d645c54f8c208643c6046d6. 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/QZ93L2127130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2408383db13bdc47b89c64e6642c089cb9c16ccc14c3cc76c4f7eb1be519fa4. 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/QZ93L2111046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f5bac9986bb149435813be018fc270e2e830daebfedc32e83cd744fb541c287. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZ93L2101534.