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 0xcec21c94e431c7276a5a7357cf31da7dc31e6b42d05770fa28178264b384fbba. 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/2975c170-4777-4ec0-a910-1b2a5a162a85.json and https://artists.proofprofile.net/proofs/artist/2975c170-4777-4ec0-a910-1b2a5a162a85.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 0x73bdb3ce59b71a5ae90a45e57244c8d43dcb4e657d540c7034dcebf2c3192672. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/ESA031003802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x271de3112669783c6a33b78f576c6fe3c6220f71a3310aa0b87667188abc2024. 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/ESA031003809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x422ac249789141b73949f6da7d398f42aedc3ded533b93e1908f90322151046e. 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/ESA031003810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d0c08bf995299ab970ae546973bcf31b5af0e0b6b47d0e18e90ff537d77a4a4. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/ES6010600235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17a562c121943966e4b167eab11f256c0a9a7c8e526e73dffbfa06b888fefac7. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/ES6010600242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6cd1631fdc3a29b9a2118eec1e9d17b8aa938bd301564a1403e176424909ce1. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/ES6010600244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a2b52982b31cd8f1f8b5dbbc6aace01d2d86f1739b3baea4ec8014d0ad3045a. 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/ES5700800169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b30207c36af782d2a82aa53449e116c3e1776ebedd70b1a893942a9fe62af5c. 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/ES5700800172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b075c9b1085ab7f85ce46696088906a3e8a2ed3730bf89a777e1b3ff0410ae4. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/ES5700800173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x268c64b0144b2a0b5b1ae92941ddb3f07eb41779360d3256f849f561784e7aac. 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/ES6101096901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef18b06b0fb8a1538e2b88cd529dc19ee0b46c20694d3980667f8fa9837d2630. 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/QM6P41527767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d83f3f6ebbf156cb233a71ac9a95423270d95380a7e02244bf7c4cb30b3f980. 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/QM6P41527768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x489dff4f76046228fdfdbbca7e750a03ec11010eccbe09157ccc41739890304f. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QM6P41527771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad1caf3a1079eee4b3071435ddff7d8aed8559a77f0f7d79c6a4de24fd2ad07b. 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/QM6P41527773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8359d4d1a8004bfed819bc222021c22c9fdf0a9921485eb16a9e1d430c1ce55f. 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/QM6P41527775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79a11b19ce32e33bad5088e8989625772b90bd8c732a54897a86ec786d76e03a. 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/UKXN21961113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b03a0ef47baa0d31acbe543160796bf14be6e460fbcb8a5fc9bc19fec243bff. 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/ES5052300585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc902f629b7d00e9a325d6eed587e75494c6b57faca934de38cc6347fb65e7bf9. 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/ES5052300801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1974adf766e9db3159fb466813fe5cdfbd3c184c690fdb97c15b75db7889a270. 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/ES31E2503439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6909bc08ee3b36b23795b4b25efefbeefaee81e9663f0bda6037a589bf91d9fc. 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/USA371657852.