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 0x4c84d5141f4ed136ecb8cd84bf594d456a703e44a09653adbc3013a81bcec6a2. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/037fe6d4-0c63-4a60-94ef-7b60fda3cec2.json and https://artists.proofprofile.net/proofs/artist/037fe6d4-0c63-4a60-94ef-7b60fda3cec2.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 0xbd37b5f53ef86a31f27e05ba95213268878bf2a0844a271bbc54c48412feee4f. 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/HKG731603284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b347d3a7d84b737dbc01678054525ea95cd868c1783c7afed85cde4029c8b4d. 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/HKG732429502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x138cdbd7ec7be4c5293efc8d5eda97caa1ae3a689c2b57c80c38f6cf67c469b6. 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/HKG732429503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x841e51aaaa5b02279ffdf4bf05a2fc459bed706c3cce75a692b08aaf7e141ae4. 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/HKG732429504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4bc4b36d561bb0365518353ae13718971f00fe3cf185c3a5ae0745283c96442. 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/HKG732429505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81d69c62df259ccf73f3267260b21d8b568dbab909425b37bbb8e4db9519c32d. 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/HKG732429506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb296565227655909858ff4985559844d35c3c610ad9ce34984b698dceec67b40. 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/HKG732429507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36ea214394e9ac65af87cbe07de6e61304ae5b5e4c2ad25abb64ab8f93bc83ec. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/HKG732429508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b915cf890af0fd7efe8863304134eab18e5d713f57384a3575df66416fbe0a6. 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/HKG732429509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ee92c10469f14bd2c5687fc011e665d7adb109da756e97a4060c94992d3da66. 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/HKG732429510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6660fc47110669c1266d9e46675a69353b96e78a309f704a3b1d2e4a626fa51c. 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/HKG732429511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77b836b3a59f29bc9e5f0269cb9be2cd3a374d473499c6c631658ef2be0e8c00. 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/HKG732429512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb89d9988b3df76f0eb4ff2cec5139593c767d4fa79cb080c1a02a882fe6400aa. 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/HKG732429513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16199879dfd4c05ae6442ec61830d7b66e0324f609fa54a2b8bc45431c9b4f0d. 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/DGA062403646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee105060040d8b1091dd8e2c8f32ef11744e25e81739a3ad2a1179c32cece4ce. 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/DGA062403652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c033d12f8cddf82d93612377ceda41dbbbf23c74033c5aee9c66fca88c8e824. 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/DGA062403654.