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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 0xc2f4e9d2627d077c719a9db7e1005e5efbc503a56d6194cf0bf300c2c201b5fc. Chain 2 (Bitcoin): anchored in block 953955 (2026-06-16T14:29:53Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/252d1aa4-3f66-4375-813d-2bc9e7fd3535.json and https://artists.proofprofile.net/proofs/artist/252d1aa4-3f66-4375-813d-2bc9e7fd3535.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 0xe1088da7579795664baee3acff7146a906db0a309ca4be21512933d2aaf9e9aa. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/SEYOK2415862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3e85de6aa0da027453b139d206f73a12e00417d47c4eb1665981328c456dcd1. 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/SEYOK2415873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x400de616bdbbd66d209022d7f14f707ea63e6d9339a49ae14839f7e0dea64163. 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/SEYOK2415857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe20fc90b6f5c1d97621795e9cde1f3eff03340dd37fd5b7bad6ea7ac5b30e994. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/SEYOK2415851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x578e27f79f4bf044fad2cef82bc258ef47f781d46ea66bb8f4ae322da1dad8cb. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/SEYOK2415864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b702b12990fdbea1e22db5e0e72e3ad65e5d9ff2e319b5c641a2fc83610a5a2. 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/SEYOK2415868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf11fa2b306c7cb62aaa6581f1d22fdd25ab2ac829e5b40e910fada16b1ab1e59. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/SEYOK2415854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13e6a26e44e126d2b13ddf4c2f1472127f1114270cd3e300e01f5da5f471755f. 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/QZS652473580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7489f50bb9aedfbe36f0014040424c7c5f7985a07aaec03b902caf106d28f24. 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/QZS662436059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad4f883f4e4d68203db743def29127d9c0b0657799353b161dc1c7d69fc57625. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/QZS662461160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c1efd95c8a791edcf2439babefb17c299ee9fba85c3ed5c0291df65f317989a. 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/QZMHL2442638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6c9c937783171b752947c28a8a9b33adc8e672826eca8fe622ae109e760352b. 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/QZMHK2443941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x435337463149d759a94167b9159f7461951276e1e2bc6d08f318f19a89b6fd77. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZMHN2450754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bf358a3f9166f016e017f9951fd6403d069ce93f0a07214fbff044028433662. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZMHK2449200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5229ffdb9231aa0beac1d20378b7d623d71bf5f7e82aa29ce3632670a50c4e6. 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/QZMHL2492100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b8e4be87979e347abe7791ea693e269eab41e148d07d72c5757f720c824bf72. 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/QZMHL2428542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42b2d54132d0d593337220fd57e194114f6fdedd1d41306f2430fd322c8f2e2d. 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/QZMHK2463042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccfac381af072b7dd3b90f9b58dd04c41167a33a7dcbeb2e8efe975942554189. 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/RUAD62400024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b9a4da0cb9d788698139e67c6ab6507a1cf72ae2d42eca8dd055c407d00bd03. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZMHN2415444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec80eb7569d8d01b981738f102651245ac6e444d8817594ae2523068a630b585. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/SEYOK2432408.