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 0x5ea4617b8b13ceb3b18d3ece39afb937443326320207b386de3a34c07f6f44cc. 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/720c6987-060c-4442-9a82-84744dc8d626.json and https://artists.proofprofile.net/proofs/artist/720c6987-060c-4442-9a82-84744dc8d626.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 0xeb69204c449d8f931c5212381e61c676b56139955a967e2df4db25da36f4b355. 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/QZNWY2285076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd299605f0e6a55f4064f2f9bd0a55bd112750c2b8c99f4bf2d4459258e995c29. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZNWY2285077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x301daa40be31480a33c8a8e8b63f1216c44fd96b917f57945af5c6daffc594cd. 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/QZNWY2285078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96bbd8e24bf438fa57cfd89235ba784494491ce3a7a0d00d272f4eea43bcc245. 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/QZNWY2285093.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x083c9543a3710c57f1e7b77f656af82a7fa9110dced44117675a1c46160671a4. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZTB42212368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67c43ca2ddcab038fcbc3f8171f7240111d7cfdb1936e3f64279ae0fff2fbb0e. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/QZTBB2238636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36397701cc9b7c47716a97e5d11d8a2ad861eba2b3ce0bc8325f193264911e21. 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/QZDA62393629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46d6b65a7a143b526f5d3d490b0d33390c98f71ac977082a8f45dffcfe048360. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZDA62393630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bd7510dafd59eaf51d3854bf247f5c88e4c2538ebc35a5a7cff43e23abba3ed. 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/QZDA62393631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a72f728bdf20a5dfccaf38c6a556922eeb30d4de30f95870de21dc388014766. 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/QZDA62393632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2685e3f26da627e940ee3735e8ff84f6201f32d3ca36b9c99a23636f7cd81ccb. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZDA62393633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57adb825d23bece8d1152ba7314e87cbc5a501efacd8e245b29886163c0319ea. 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/QZDA62393634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc95f7ef1beff7993bf1fa07753914cf310bfe594957eeb6e3a82e1cad1f00048. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QZDA62393635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb808cb2ccda52686ccc2e8d3415567fb78462a1f85338f973d664dd16bfa421. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/QZDA62393636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a9546564461ab8782ce4888daed80110d7346afd1f91971ea05eacea037f54f. 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/QZDA62393637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24492aa9cf88b95d2870cd7f36d2afdd29759fa106b4039f4717dce0e6cb6e7a. 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/QZDA62393638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4339ae03dd53d87d7edd548380bc7c018279422b00332697987c8d3d4d08077. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/QZDA62393639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43a6953c57bf16a9bffc94eb0e62bbe33b1db0857bc14b5b883bb90f2cbd6179. 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/QZDA62393640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c59434f8b684ea8f1d1cebf3bea0f3b746b905b2030866282bc9dce364b2cc6. 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/QZDA62393641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9de6b1588ec2d9216a3ac3ff5fa0a5e3ba885cdcdd9b81a6beba0589e20e825c. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZDA62393642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c7a204e08ccd16a31cfa1b66ba1c6cbdd985ffc52d982138e148f5577776a6c. 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/QZDA62393643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab7effc317195434b25690f1e303d6be717daadfea8b6a6cbc06dea3ed9f8abe. 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/QZNWY2342093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe313fb089b9aa5bc1e69332e015ec628a54f11484ef9e53f2ef9c97ed267ecca. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZWFK2314596.