thumb|Aerial view looking south, with the Zamalek and Gezira districts on Gezira Island, surrounded by the Nile.thumb|A boat on the Nile in the Zamalek area. Zamalek (, ) is a qism (ward) within the W
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 0x3e30f1071924fab5ec17496995afa12ab68834b88748817603cbc469e650ed70. 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/9aaee990-e1bf-44a9-a758-fd64a5865769.json and https://artists.proofprofile.net/proofs/artist/9aaee990-e1bf-44a9-a758-fd64a5865769.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 0x42980c103d8734769bd008d96d20d19b2e52058279de701bd54098a40f63cb7d. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/FR59R2262228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8797423f6b17435df2a4c38eef723e8bdc27354ecd8aeb00caa4c849f3473b3c. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/FR59R2262229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf5ffeb440d9e6dae2e40693869ccc171b260b83fdd64dc5cefc35614f962763. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/FR59R2262231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfc121fb893777939a96277607d98ee8c7df2be95a2122ab939b5323b3c32464. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/FR59R2262233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f89d201a1714bb70dacc7ab5267b32f9436b0faa1ecf0ab4eeb553e12736964. 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/FR59R2262234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b747d5809bfcc66e4896e40beeee97bddc31b9bedabb579e3a40036faacf4d6. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/FR6V81669220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6203495b3c2d42ffa5c740650a000ac61398aeffcb0a6685dd4b94f9009055cc. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/FR6V81669222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc64d47d05de6f4900c521989339f8abed1ba155f931e7a76b5639868076c3920. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/FR6V81669224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1ccaed88ec01aa22a9a0495b10371a8db32ae217950deaf53498ee53cfa17a7. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/FR6V81669225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6174230d6288b4fc5e3d98b026c4e3badeb6f0655045958f21325ac906f0a774. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/FR6V81669226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x248a8e7655d86fad18d7a58375f978338b4530a8e971f403ec53947e1991fcce. 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/FR6V81669227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9c045f0c461ecfa06502e4b475df41368470b3df82b9657ef74522b4394e6a5. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/FR6V81669228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x243d9705ecb122aecb0c4df826cdf32ef413bea3067494875be56db941a6b124. 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/FR6V81669229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x820f9724e88791e0097e07f64a50d7d8ff98490b7c29dac28f09ecd367a2492d. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/FR6V81669230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9211b9425cfbd96b97e3f245346229513a1de248c3bd587a70e51e7ba49dc293. 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/FR6V81669081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4bb8b51d715b112f2fae9a2e5f89cf69e235da8c6d5cec9a78ca6558973b744. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/FR6V81669204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa84f3d6ad9e6e5b63b6f41efacd36502370cffd9eafa8b2e15f18c5e696b1f5f. 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/FR6V81669422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf80a9a16e25b8cd8ad125828f0d677515709ede1e9cb4e1404c900860e0c9c1. 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/FR6V81669432.