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 0x82816f06ffd81fdb889b32d2cb909b734596756596e531f219ab9cc0010feed0. 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/75560e18-8b76-4acd-bbe3-f5a59e0970b0.json and https://artists.proofprofile.net/proofs/artist/75560e18-8b76-4acd-bbe3-f5a59e0970b0.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 0x94800057272d88bb14279316b81e59319d3aad47ca18a921aa389609bd9f883f. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/SE6XX2129906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eb2419d5b36c1aa7667f82267488e6b0492d8401fd9d4277fea3d8fc8e1da49. 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/SE6XX2149080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa5ba33c6411c03d205308aa5cc3aadcb3d37cf892c746990a80080b43e8735f. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/SE62M2171450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde80fad12c168cdd675267023a6c9a66331988d13fa35205abdb0dcfab4f0661. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/SE66N2236370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1f51eab9b932eef24d870672be000877129c6f37afb96db63cc56b53cd4ebaa. 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/SE6HN2341793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d93ebad1667c75f905b0b91327ceb13b7ce69cc25c03d2b5a84cba6b37b21aa. 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/SE6TI2312229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06c7451f649a82e6e33529e6f2917b84bc3866eae2106841012437392689468c. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/SE66N2345553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91017e6e3d26e3412e2c0c422e49200163757aae1f1ee7c103c24ca4385da464. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/SE6I32402322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe1b5c8679fe256b4cd33f82e36e3fdca95f7f0fbe80fd84eb0c185dac4190d4. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/COAF42498255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e9d34f569a09cbbbf3616f2689ca9a3403b7d2723b39594f857dc4c7122c8b5. 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/QZHN92590720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e3f8b216925e8b197d1fb5e1fb069116c0665b9a897ab07e5690e035f2c95b6. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZHN92590724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aaa3738c5b1467ffab85e585c06f17718db958264c3795a1631cfde2c7eb851. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZHNA2529733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x146fd08e6d36b1b0d00156879ea828368d6808149a1daf3c4fec2d4ad0edde64. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZK6K2539068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bb478960b56426436417b90b740578f0ee13ad46fbacd286d7ebbf9662d6fb3. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZHNC2523302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d2c1e4e0d84e278c9e3b61d09b1a5d61e3d653a5e10bbc27582939d5f069a31. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/AEA3A2118243.