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 0x6ab7e62df7cace813bbbb1108952e198dd4f3c1cb17e220727184429d3c9dee7. 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/376dea30-16c5-4a86-88e1-240332cdff53.json and https://artists.proofprofile.net/proofs/artist/376dea30-16c5-4a86-88e1-240332cdff53.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 0xdda1f53c8efc50708bc1e92f1601c30805947c8273677bae02cea6439aaad705. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM6P42203734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x623398a4813459b4db1101eb86c5ffd5a44d1ca2b798ca1010fe2e8e8c63fb8a. 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/ZAA3C1600021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x103a233cd12e4efd96be9fb2280b248529fe3b3bd9382fdd1ebad03769816c18. 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/US23A1536728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6233f0a88b5794111c5b5a8636e51cde3593abb6d3ec14dcaec9797bafc7be56. 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/ITFGO2100038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc482732983db7a44f1131f519f029e607153b8c530ee0ee434011ccce859cd42. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/ITFGO2100090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8de3535cb0d59f38fe6d6bbb6d2ed42a1fc031f6a405d5d9a70dfe00e2187395. 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/QM4TW2136243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc08a60195d181ef273b5c37824384fbb2a7246434f276c30f6a9c4517fa64c1b. 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/ITFGO2300090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb2ef6487c070b61d4af061c6d1d91476f21659e0e73c21aba9ca2446368a1ea. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ZAB5U2000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbafbb7419987840067124c85d8028c9794af82327391888cbe3f3b6e826217b. 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/ITBVO2200179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f73183a7cb6926c49a089160c2eb440f0574879bb704ad6d1086e9b5aafad6b. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ZAL6V2400021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee140da7fcad9dc3e30c6d36fec0a81c319496d457b4a1d75b1d6baabb97e651. 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/ZAEI71800557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x072871d53b9d4bafe16d48eea79424fc0cc1ceb03f28769c1a00b3192613908c. 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/US23A1552669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfa9e6dd72838addd64a46e2d235dc0983d04236fd59b31517186d0e8a6271ad. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ZA10C2000038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65243b12f4c54d1e82af708d2dd593972d5f93115b4cddd59b984221dcb20c60. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ZA10C1800011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9d292ef92b2f5d8199028c8ce13d16df0cb730a9bb670544c85dd9817b8c1ed. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/ZAL6V2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9b1e7ead0ee93b130c32e0958988c6577717a09c9df6df10d122460ac06b9df. 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/ZAL6V2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cb7c52a2a9de932912b058d3f4a18d3a9094406cc91cdfe7fb132f53ecc8758. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ZAL6V2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6af069a648364939a2456488abef80177cdc9d462431167c1b657f5c482d17aa. 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/ZAL6V2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5096af26df64e3df3557bf5ad2d04862f0d60f765ab0183460c35d82f592defd. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/ZAL6V2200005.