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 0xc045521b6bd6048ba2522ccfcbfb7791a94a496edf4a5993788a98201ab94f04. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/df5bde17-07d1-4947-860c-4c374f6b9f20.json and https://artists.proofprofile.net/proofs/artist/df5bde17-07d1-4947-860c-4c374f6b9f20.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 0x1581b789d6949641f71e498d5394cfe4641c4f882ba841347c26be1bd7d87324. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/USL4R2154948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb37faa0c77905ab2e01c79f6497d30a16758eaa2ab186c8e9eee7d4b9a2421d0. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/USL4R2154949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e34876dabce4e4eed56529820e9ef790accf40af2696464af6c729a46ebd92e. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/ES7860700925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2637a589c7709e07c38476aeaf1dad8a73297be9958f843fc5a03869487bdb3c. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/ES7180750902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x248cc9509a02987911fd347e9f64009a60284051cb6afdee3b121ea5bd9d7b4a. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/ES7180750903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf034a10b5776e6b1440bf36b79ae2bf160863e27d1368b4099c14bbc066b27cd. 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/ES7731102113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x716f8f746467f98e6df93c65027d5645e51de1d175736e051d2c80a4f35d08a5. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/ES7731102114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x274495be3d7706f583b85e0afec2e4403d83e606c6ef88e40867f4e7e19c7fce. 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/ES7731102120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6e4b73aa6e6d950e869ff4df488749c194ef5bbb522ace5bfa1d8296ccc10a2. 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/QMARG2050919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97dafb79d08aff46fc02d1b149ccbb63248cff9f1aac2c27147149fc8c569766. 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/ESA092595313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2dd7703e75b4afc5e2763aa0a4ad1e18524e522a903c3ec80b18d82f2fc56b4. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/ESA092595314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38c8e6a81c14fed68e0fa29e5fd3e1edba8cc58b15e1a9756c91a65e6cabb502. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/ESA092595315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e4fce9828c8a9ec3689544e19e26282bbf0f084224168e4bacd8c65c70344fd. 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/ESA092595316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef649c539f61c0ce80cc56b718c35fa1364ced8536789c9f2ebe9f73e2c8ea9f. 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/ESA092595317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeafe507079c4a51cf8c2ca1cb4a27a41cba8ee64f38fa42ec67c8379184aeb6d. 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/ESA092595318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b8e26a184b08dd2020ac85d9d5a9cc6453c4734df96c7008ad6a69cc6864098. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/ESA092595319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a808a21f91be177cd37469047bfe53927ecd315488ccf4df349a86a740a042b. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/ESA092595320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1ad8a1fa0ead1f86b12dee8e0bd393999d01a60728e6d8e69b8c4efb5f91fb7. 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/ESA092595321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfac52e48c6b9bd006f522783342dca5c596f10967168b41a78b26d24eea074a. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/ESA092595322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44e71ad648479b4e66c9c76a4ab78a64a141d136aaa8d32634deb230494a3628. 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/ESA092595323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9ae7ac2bd1a0de1570a40b8ae3ff2e70de62672a561ed7098ec7eda43beaee1. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/ESA092595324.