Tanta is a city in Egypt. It had a population of 530,000 in 2024, making it the seventh most populous city in Egypt. The city is located between Cairo and Alexandria: north of Cairo and southeast of
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 0xe4060e5a88265969e330ee832f470bdc81ab87bdb1977f3d250ef8fe87a37736. Chain 2 (Bitcoin): anchored in block 953695 (2026-06-14T21:42:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6fb561f7-92df-4568-8d49-fd6d9ef2cbfb.json and https://artists.proofprofile.net/proofs/artist/6fb561f7-92df-4568-8d49-fd6d9ef2cbfb.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 0x2c2a87de128bfdb8d37bf7e7782c38bcfa010bd505ea6f758b8adca807e8366b. 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/AR0UU1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57173319465dc04c0f48870c8ae5d12c2d1cd93ffbd37b267b47f6b2f30113ec. Chain 2 (Bitcoin): anchored in block 957026 (2026-07-07T11:02:43Z), 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/AR0UU1900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fafa49e100019864eb9af613f8c69ab6f4aa49182ed2b7ef12a246cd551016e. 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/AR0UU1900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24efda9e190d7412f6e2cef1f0aea2391a885bab93f69b4d6cc67f366697de42. 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/AR0UU1900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5ca22c1e501d627e84e86f54398cec414979f4f613e3a1789f3d58111f9c284. 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/AR0UU1900010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d0cd87bc098f21e668ab43f40ece8a43c021858b69cba8a8b89c8ca20b8c5cf. 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/AR0UU1900011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e425f571ba537727990d4389e46e27edc66affe162ba3705b43eb3c54e28fee. 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/AR0UU1900012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35c26e7c8928ddb04bded795cf4767942c8b8328cc529751dec0bff6f09252e2. 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/AR0UU1900017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x115b443a41292de0f42098c1cef0b93c307899930932e9d6a0b541c133e1693a. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/AR0UU1900002.
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 0xa3fbd6e088adeda1bde64832d607d2a6d0dcf19f047181ed336851858f7381fb. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/AR0UU1900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd48c971387607440f25eb64121ee79a52f644b4c21bfa73ec59de14ed7fe02ca. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/AR0UU1900014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e789a32e5bf1d688ef981a46969e69afad65b7bab55eba5bc27ae789be67e63. 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/AR0UU1900022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d52da3e5f127414d99311b04e8af1043f29035464defb725ac398fae37d02b7. 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/AR0UU1600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6fcacc8bd51bff9e828968af7208982ff77240a20ae187e3f5023cd08e48c53. 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/AR0UU1600005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58d3db9f9a214cb37302ed3b3e69111d7ea85bdbb5970a0ecb1b3dab36748feb. 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/AR0UU1600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x575d46f36211501c29815a50b00096c1d080c2326f508aa0fe7f4fb9f11dcf50. 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/AR0UU1600007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca852794c3cc6f048b87a3eafd66edf26ba23c0253d292b2536865014a59cef1. 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/AR0UU1600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83bbf1ecf328baff47cc200ca2ef7a654d012fae8924bf6bb4e7540e46d0a2d7. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/AR0UU1600004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7873df375135d9ed0daf1dbc9c43db76d33f5b8bdea0bdc778773afff70ba47. 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/AR0UU0900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64762a65712a7809e2254b63099af358d400cced816e2efa43251ee2aa395de0. 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/AR0UU0900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7af2172983eb4d480321d9c12a19d127e98646908c856ceda920c288889750d6. 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/AR0UU0900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2159aa6e103cc5a52b3367bf92065ed0a9b24101cee7648ddae3f9f62d2b1f0. 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/AR0UU0900008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x411dc5c98d9ebb132f4906c506c7b60978f8f5939f8d86a8458686b3eb821e18. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/AR0UU0900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5e9f25a9cc6d0aa696149df36d0fdb6c05f63e624897855b9456e31388efb66. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/AR0UU0900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeb69b829c6d2ae9e83c44d428f31627d8a207d8625af58b1a8e8e61ddbc4c0c. 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/AR0UU0900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d3f824dabfb099ced166b48e617a1cf1872f6b5b59cee113b9ae9cf6da74042. 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/NL8RL2552139.