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 0xe84ba1c1fe3235d207c6f2c8da635b0a767daa37073349dc3f981ece1ae14ac3. 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/a2e22690-1076-4b1c-9711-f768a3f06d1b.json and https://artists.proofprofile.net/proofs/artist/a2e22690-1076-4b1c-9711-f768a3f06d1b.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 0x5038228f81ed28bf71bb09dc58785c1d1b7a00502ca335920745ed4263905fe5. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/USX9P2403279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86a2016c7992a839121a29131ec4bdc107ccf1101c3bc226a20334355512d7ce. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/USX9P2420024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16185334d3c8805fb47a127aff82e91e823887cc5ede05ac9ec14ef00698dae0. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/USX9P2420025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe190c2d3db31bd49ccd6867b4d566886a2b185d371f3f0027e2650fed123fb39. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/USX9P2420026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3153068c3b4755af2183ef6773393e018453b63f507f037dbeab17623bda50f2. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/USX9P2420027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x779f8f6fb5bf84dd1cebc66657fdbfdb7fd07f384da0db43c7cbb09e77d3de2d. 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/USX9P2420029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06f108ef31db986e4b9c1733e57120ab44bc5e6cb81fa31dffce5f1949abb1f1. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/USX9P2420031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39c3d9714ca1f7bb41b0dd8328aa79c5ba13f764c5092c6a7145aed90e2b4f74. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/USCGH2531448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb374d806e83361da64c79e4fa13c6076b55910ad71617f5743a4011aafc8f459. 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/USCGH2531449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1f6e5f94db328624cd6bfdba8ac29700359c0113155652be842cd655af0f188. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/USCGH2531450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c2a392d299466876aecd913172cf536f59d59ef4676ba3c6980f6ff4c2fc070. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/USCGH2531452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4af9ee5a8f0552deb1358df61104798510f596e1cfe8d15ce8bcd4a22115dbed. Chain 2 (Bitcoin): anchored in block 958493 (2026-07-18T04:34:53Z), 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/USCGH2531453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c008202e9114a583213a55facb062bd89fb3df3161eee2cc92c29960cfb9b2b. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/USCGH2531454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3a1e3bb98052dcfb5900992348e9888a27f257d7a8743a342647914a2dfc296. 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/USCGH2531455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaeec0a1be1e26365396c4f9b4577a79261e8c35398be0a69193765bdf7baed5. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/USCGH2531456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a57ca2093673a5f15d6c8e3ae35d39ae7919c90e7fbd6b350da862b7f723c6. 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/USCGH2531457.