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 0x842d82ffbf28007e29b45f0bb1fd7e71739537a4025b47c56f24fb810cf66eee. 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/f46954c1-d58c-47ae-8c70-34a303caa104.json and https://artists.proofprofile.net/proofs/artist/f46954c1-d58c-47ae-8c70-34a303caa104.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 0x8883239b5eb44e329d50d6262f1192868401b45fb179d540a2e123b170711da0. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZHZ32224830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45501f7d7f2818dde34281f7a9aa7d3324321f2acbe6fa4a5c1bbc9afe1c5f16. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZTAW2395299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5508dc615c12a14de6babeabc03bdde73ed2bb9ffc3cdc866cdb010b8445fcc5. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZWFG2347555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdd2c29db24c2bfed25dc40b79f7f99d1e50b21aacb2e0049db7b9fbd134eaaa. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZXYG2401871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11549559389443fa1d02ac403936359d5d19de87724abaada343805e89850ee8. 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/QZXYG2403073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x933041651a6159ed8d813f005a9b2b1af5559dc8d4dda5c106018abd9f1c7122. 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/QZXYG2403192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46d8a67bc5650f1b76a574fb378f314260fddebd08d30eddb488bd3510ad68d4. 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/QZTVM2459416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc213e6caa13d2090d01b4074b01592a38e3b344bb8b915eaa832a8193f5bf8fd. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZTAZ2386123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04f4d6af9b1adfc2dfaa47c7749eef55e915bd616c1f0a1bc0683206112a35ea. 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/QZXYG2404995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe57ec4dca6798d1b0f4dadad4cda698bb1fb5424ce10d3d76b727e578091d4cb. 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/QZXYG2404996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d22fcbb90fd0756abe6270b6f971468082c240a307c8d4b81f85ec73dfd3770. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZXYG2405001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03ba3ddc01afce0ea3a93ca9fb2880aa53b0a958a7225c57419f43d534ca7fa0. 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/QZXYG2405002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8725234157c6d8b8be78081167b0297663408786334d46211e2a7a2c0923413. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/QZXYG2405003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba0210e7fe6a3885dc38c5c6cf1aa777434721312366151058004a8c8e5baf4f. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZXYG2405005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x565f124f7f2878aeb43ff62f12ab7f559d6b4cd37fac08d195aedd6a69674e8c. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZXYG2500645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab838bca69ef875ff40d56e96fd2a19a4a1617356be49e65aa39bba941de5050. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZGLM2555624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a5f54c7c028b94d6cf4d60076bac4e52c6cf9224a123741107f012317b659ff. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/QZXYG2502583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5ba4815c527af054086bc6232be0b27a3f63876b645a57243ef22e3f2c91e92. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZXYG2503100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d22605835be4f4922a090da94a6d018017560ccde47f260e30f32926ab9bcf6. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZXYG2504484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a7917653a3e0d0f0365af8789825ce3a5defde2a196159307adadf99ade7e41. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZXYG2505567.