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 0x2420f59cc44621a69e5b44b0ed62efd75173b8bf2a9cc4559e1dd2555b5aa86c. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e27cd9a7-2be5-43ff-9a43-360230e5bc0c.json and https://artists.proofprofile.net/proofs/artist/e27cd9a7-2be5-43ff-9a43-360230e5bc0c.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 0x174b150190c12ead879b8195b6a23d52e76f81a26ad47f21b86e141685574b6e. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/TWDH52200012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1205559067eb8083c9aa8f9be02a1a7980ecbbdf1f821b3a4c48187e4a5d0cfe. 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/TWK232283280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc167c2ef2f2f43faa466e573d3fd46f7c416b64d9f1c8a081bffddb5f1089f66. 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/TWDH52200014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b6f1bb9f52dc0c4aed32c3118e553c8d4d92e631a82b6368d638379715470a2. 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/TWDH52200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b216936c6c8908dcaf703e9b28d05d65bd9ff36a61c826f87f2982d44be524f. 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/TWDH52200011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5651c07821197bed3c41cdb7df0e4bde94ea509d445683a930915d46f6a8565. 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/TWDH52200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67dc9f19f53af03425b23bc551f0fadc270314a9af2d04feafeb22ddbff67d7a. 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/TWDH52010090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x467072ab2635a12cbae0673ef85d667efa4cf3ef60856a66849d0e6b6d8fbcb0. 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/TWDH52010091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fa59beab5cae04f31ce4f9bab45fa34c95da79148e1d825bb418f85b082c0de. 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/TWDH52010092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1ca5920c1fce43a446e988bb75c2b539c77e91ad9e4b77b616b6897611d083d. 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/TWDH52010093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23a3cd8ed535301b16e632b1b5fcbc647eb9f1fa488dc9bf3b49fcaadc38db93. 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/TWDH51705397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c8e86020099ae5e35b157f50544841b102791abd19fcac9c537b525815accef. 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/TWK232182680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0924fbf923b2e65c27b50ea7e1ce1ac89b35f09dd0d70805ba20383db19cf95. 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/TWDH52010095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9289436a785bc9b1ef1b58ed2e698ce7462a6f68018f1a9f81166c2af6ab1c4b. 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/TWDH52010096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca24ee4c3f8e81b724e43ec91923adeb2bc616d99b475d12cf0b1024b6314c2d. 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/TWDH52300379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd8aad508884b36c3cc036c43757317ac5f1f3b00873e23eb0534aa59b06c05a. 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/HKG732483266.