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 0xc7926b00a0b0c26a8de26115512421c61caf0125f53caf4d3d6cae1ca96a50a4. 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/abc7e73d-2878-469a-b7e0-44d494489632.json and https://artists.proofprofile.net/proofs/artist/abc7e73d-2878-469a-b7e0-44d494489632.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 0x178b3744e178993af19eafd4feb670584f2738b9fdc20e27e74b84d7058e0714. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/USDY42011468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3afa6d2f725e700fd8e5b8f51e6a66563a685290f6c16acb51363e4f04adf1e. 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/USDY42011474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e16eebfcf61f941a57bf8da2b85f06278aee1b2ac5f53bb89ed89c437024812. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/USDY42011477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34a54201c1375e118a3aa5506804baada5d93bf0a7151a82fa8cc4d63aece20a. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/USL4Q1908895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98c4c9c05816b71a2772d31b9c69171445c383b6fa93db204565eece43c1229c. Chain 2 (Bitcoin): anchored in block 957735 (2026-07-12T17:47:43Z), 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/USL4Q1908897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fdf2fc9c3025f5c1f44c0b8ecc2dab56c454d1d0cced9e697f6a037fdba6be1. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/USL4Q1908900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47951f4e52076803b1e137083078a72c8d7d48b78ce6b4625d1fe99b5917e24e. 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/USL4Q1908904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ad5d35606d058bd55c60e535ebb30c8c6e1594f280ec5469d4e199613ebb406. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/USL4Q1914791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff1db00d24cb756f783272a71aa4bf0a3b277c609adf440d6b9367affa02feb5. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/USL4Q1914792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20bde254b97ff35f0a1b9b19dda98a38f342399778efa8bb66ff02ba532b74a9. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/USL4Q1914800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e16c1dd48072a3e46c6661dc0a685946146dd2a2f6a6e28fddef6278dfd7363. Chain 2 (Bitcoin): anchored in block 957737 (2026-07-12T18:02:09Z), 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/USL4Q1914801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7671ad5acaa33a94ec3db307892f6c407dd59ad0df76e53dd6d437b92578ebf. 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/TCAFX2146841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63cc43b9d9079674705f70f2924c5bc48d95f6f11e1ff568ac87164b70c28a04. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/USDY42300573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x669ac75e58b92f41778c3869398dbd3477f4c32af65c19df2d2389096614cc92. 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/USDY42300574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x730f470bd6b6d847c251166b5c2705fbcc0f9c66d3bd7c232d774fff44ca0f9d. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/USDY42300575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa22880377746df707a4e296e1f2024d274e350bd62c2a9190dec51eb24066275. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/USDY42300577.