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 0x05382afacc6f1def7667039adb2b607e5c173ea43bafa21a2f8161be193071cd. 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/dff7350d-1410-4571-bad7-28b101b88338.json and https://artists.proofprofile.net/proofs/artist/dff7350d-1410-4571-bad7-28b101b88338.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 0xaf34929aa7ec5e35f32e2c9a4bea7852d40b305693afd9e8a9589ce4044e64de. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/ZA38N1700036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20a6b176e31e4d695a4cdfbdda22b66e1e95fb88365bfb4d47aa0b48c1055000. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZMEN2334491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x794feb8a33983b225a982d870d158774dae44a6632925c250f532109a05f46af. 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/QZZ7P2437604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f9ed3ac84395a043ef539f3eeab8591ca3f154a3add5d18076c30b343c6ec4. 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/QZZ7P2437605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x401a68e6bd0c825e707f16c9a8c464648729afa9a4c72601eb503b2ff0a4f48b. 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/QZZ7P2437606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa99a0b163a7b036c874f82ab590a090e93334c97776a8e72e814796d6a79fb63. 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/QZZ7P2437607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cd33404f6e35de339c25f2d2a519345c42643e95101e83bf251fdc7584f8c33. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/QZZ7P2437608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a2dc7505f835b2ba7481b3dad60f8c07ac826840ab15017e09b6c03774ee8b0. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/QZZ7P2437609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x053b3e2d1506272886c585e40272c249171df7bcbce70da97ea2c8994b4710b0. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZZ7P2437610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3e52c7702dfb3ffe81deeee4288dc2cac8c50e558c4cad2b7ea7f6c043f057a. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZZ7P2437611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd6f9ed7778060af1f0428421d9c42d930c1ea8bda50303c724260838b34e542. 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/QZZ7P2437612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea0f416f05c8c7a250529c01306cd93e479018398575a001708f2bf60b21cb06. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZZ7P2437613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f007d303827dedff6f9bd3ab7d1f223bd9fae6649e7e22a865fa2040b854021. 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/QZZ7P2437614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6879b95a9aa94ca8322673cc6d930d6d623e7297e15873eb64f1c4e473af3ffc. 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/QZZ7P2437615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40987a39fb18f94d305b52943acad3cc5d3dfe48b0ef364f7e1101dfaea9f419. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZZ7P2437616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef2a5ccdc9a1455c051709e60fc794a41c916fa34c239c95b7cbf118b0c66eb5. 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/QZZ7P2437617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf01934ae43b65a62a6c01e77ecfabdb6677a301cc8b11dde49c98f4992a37a11. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZZ7P2437618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa857d432aeac1f47d018d57d4ea411d603c1f985cd6337ae4123874b49bf0cb. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QZZ7V2547258.