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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 0x36986c4e95130d1d8b16ff0e0847f830a86ded3b0535315f5234989079b29ebe. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c2901f7f-dd7d-4d11-bada-eee3fdbb0034.json and https://artists.proofprofile.net/proofs/artist/c2901f7f-dd7d-4d11-bada-eee3fdbb0034.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 0xb5d6dd2a68d70d472753b958a4742008e0ea286b3aeda9d6a59db6c4221e30c0. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEZC62390537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fe2f28575c21e5e5a4f7d541b5ac0079230510aad0468ab012017517cd399b1. 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/DEZC62390538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2eab2521c3081573fc95c4bf5ac9f20a389edd73e565b902d90550d1aeb32d7. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/DEZC62390539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x259556be8e0f354a5df21ba1c3a32142ab04259e6d27aea5ccc728ad21438ebe. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/DEZC62390540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa83211ebab9a4ac471ebde481ec54c878c8ca7fa30163975f9faff74bdb635e1. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DEZC62390541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccfca07fbf964a327521c193f60a8bae1848aa72fd67c61f160d49fd8fcdce3f. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/DEZC62390542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92508ca8720e4ece001b9069f8f381c4e63aa4d7be46943c2ea1a5a6c81d1239. 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/DEZC62390543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0190f0824d44c80dec67feb6b0e38a22c4e0450890fe4823e269fa0d13caba6. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DEZC62196145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa1a4b8e78e368c319ec7dc3c27898afba492145508c2dfa17260976b7af476b. 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/DEZC62196146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd960f4ba1c166edc9a823fc424ae7e74ae92168c93cada276313ac721ee81b3a. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/DEZC62196147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf46ed2ebd7d632a293e036fc40f85846c18fdc2111156672dbf9f71fd49de5b9. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEZC62196148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3095005cbbe00821a12e93163d5af7d30d5c3a6c9d8cf55ffdba360e19732108. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/DEZC62196149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc20e3ba772d36e0b7689993b357483bdda88e01fe9ea45539c5ab551c8239e50. 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/DEZC62196150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f930b317d53a3407d21ccfbe7bd80f6556b7192158e1a9b4f6ca5930db59d13. 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/DEZC62196151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb0c19af28d9e329075e85f0ee680701c34cfc09eeacf3bd9db9372cb6dcfe0e. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/DEZC62036943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe23936fa7348c71246c422b5bd86d9da534aac43cb28431d0db43e042b740e5e. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/DEZC62036944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c3ba0e3b32c84bd82fa6e970816248ca42726fe8d08c6e4448937ca95c6951b. 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/DEZC62027227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa65983cd811fe347702db5fd3292902f0d28e58e2cf65aa8e749f4db04def023. 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/DEZC62036945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf22cd15fa178b8a7e7442277dcde8707863260b45b726cd126c2743a0b603e4d. 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/DEZC62036946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb23f9a569b198b58ed7df80c1f2f5883d3f722f4b59f8a1060bc6380bbb9eb2c. 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/DEZC62036947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb4dd1baed933ddc82de0b4443e0e9ad1d23f282917cbf6f0bfc226ec3b16cc6. 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/DEZC62036948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1ac82754ba444636c0c27dc747c79a408b12880f7f16cef8ad5f59e5b762c64. 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/DEZC62033484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21c87585d0457886f0757aad1e5486c5872348ff6c211d0fb397f43dc5fb3284. 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/DEZC62036949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe666047b47a0a50aa67a5edbe8d1adaaf9079f2a83aaecd6217d5e0636a78cd. 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/DEZC62036950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8ce3ef28be2dfbc01137d7e0fb6d1456aa05dceb4293478e70945768ac24f84. 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/DEZC62036951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0d65730ea71af2f9c74878299f7c35fbcce8671e65c711a55cc07c5dbac0c56. 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/DEZC62036952.