Chan may refer to: Places Chan (commune), Cambodia Chan Lake, by Chan Lake Territorial Park in Northwest Territories, Canada People Chan Caldwell (1920–2000), Canadian football coach Chan Gailey (bo
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 0x604fd03fac5beeba96c25fe0cc5cc5403d7d70d9f69278185ab788c0b2287ab9. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4aa8694f-c873-4120-a38a-cd5ae2d1e709.json and https://artists.proofprofile.net/proofs/artist/4aa8694f-c873-4120-a38a-cd5ae2d1e709.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 0x58cddd48426b0235c9658e6deedc8559ffea4b8ed46baf61a515b65fa0b20095. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/USLZJ2258793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93a2efcfc7ed8a5b0b9c4e49be527112af2af8599b795b66ff6c6c4974a37b4a. 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/QZHN92271168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ff9f04da0c5a652e2b527f3390ba0f779810162989912d09e796d36d47ea083. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZK6F2252733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x335c0f6128c136ab30b98a45a55b2258e12116804ea80fa5dfd9f4e9feed0d7d. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZNWX2293587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b8b75f7a3482638d982c77ca24f2e01d09d369b8acca5df1840ebe5e2a1f695. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZK6K2393115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cc856a81c4e157db8b3965b5be5dd9f7e9c92d07408518d4d7505378ff962d2. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QM3DF2287596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7111090f65232976f8147260533ac30f5fd3d78fbb7776e6f66ba3c6cf986b5c. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZHN62428749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1c58795001a8b9c7c8c011b7283bc732300eda4bcbd28e78476569b99651f7d. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/QZK6L2480881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab3d88447d8372f333065fb386161c9a585fabc9497f9d3752a956b65b713317. Chain 2 (Bitcoin): anchored in block 957866 (2026-07-13T14:54:25Z), 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/NL8RL2425682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeff2576eb1a00b04d4eb1e3bbd783cd9d0f3ff7c232d57ea501fcc642d14627. 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/QZTAS2458670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5850e50c696d707c76c001e78901c8c4c4b49d6ce67c43a3aa51040a139d5a29. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZTAU2430816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ddb3e628ddef4aa6be4a1a48d37a91ddb70d03373a4e7c5d3f5768a3a39144d. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZS7J2496050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf62a3cb7aa7fca754a674524a67fcd814420894d390195c77379a3b075c7ad8e. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/QZS7J2497896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a55084aad36af1a6196f9302497fc9bee135eff6187c1e66830483cf8cd7847. 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/QZQAY2589762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc6832b24b54c4912b78df42a169d88f4de1b00bf7e44e10cb40d7dc2654eb98. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/QZTLA2527021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1b859e25d415110930a403010893be9ba95e5f7c2cd1c38fbb3ae6f8b764fda. 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/QZTLA2587131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf2ea50291471df67e2fbd8cf633766226d1287525c9ddfe74c3757921fced1c. 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/QZS7J2470296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd49ddff4042783c21d08db7349bf8e23b9bdacefdd67364388a94d7254e83b83. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZS7J2545395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab26ed5ae726221c1fe87dee83ed8da1cf3db56626cc896f7259cbd9fdbcc3de. 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/QZTLA2582547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf18da1b4415d6483d4d310745de8df9642b0c2276a5df2ef531de0dd1bfc00e0. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZS7J2510273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a2663c549e4b67dd618c7724345f372d19977ea7d462a8c32d49a171a220f52. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/QZS7J2414344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1b859e25d415110930a403010893be9ba95e5f7c2cd1c38fbb3ae6f8b764fda. 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/QZTLA2587131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47672c729a7312383fd87655b6561ecfae76f4ca4c44b9ebc307f221506bf64c. 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/QZS7J2599677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xece06ac62b0102de63432f82fb000078cfd61ce12f47d6cf8242176b92384042. 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/QZS7J2596446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x154cd0a101af761c66448a392990c9c34648239725a802bec9aececd679ba273. 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/QZFZ22367451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x154cd0a101af761c66448a392990c9c34648239725a802bec9aececd679ba273. 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/QZFZ22367451.