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 0x12e9abb80ed2ceebc3bda7603a675e7b77e1e6e992ff98b5c43bf22e45dd9eca. 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/6c2f0f7e-616e-420d-9e9d-a3831a126834.json and https://artists.proofprofile.net/proofs/artist/6c2f0f7e-616e-420d-9e9d-a3831a126834.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 0x135807306103e82f1b9069390e0ed30c1fd7a751b97e0d4daf7c189bc870b8d7. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/SEYOK1211617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9d9f733a0d2b0bafab00e1f719c785dffcc554857c86f594057cea6dbd34333. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZMEN2348585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacfdd838512a0fcbeb48d502ae336f5d517a325372c251c23b42d207454f60bb. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/SEYOK1209852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8683be4421faecc75260009f028707f5b5d93feaf6323e9382689c5cec892dce. 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/QZMEN2348586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb55104a28a0d9077b9ebdc6f5510e44f08737b79496c92334e7beaf8ff3f170. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T20:54:50Z), 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/SEYOK1127601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31eed6cd932bd1451f0fa022147c8b7fd1a0dcaa14b0a9201f1ef77263f3456a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/SEYOK1127605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bd2f4caa81535df8c9afc02507fd1f675e8a690a00db430b4beb18c14a15e0c. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/QZMEN2338774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7cf95bfbd865b4f33ebd0045c3fe6391fa96339dc815d7c533286f7eae9a9c7. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZMEN2313515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dc2f0e60a0f82942ecf7d724b84df45920c801a6d3783ae7d07753cc18e272f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/SEYOK1127579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a6ce7dce7a5a65cc6f6b807ec15ed85dad02806ab98deece0b908118f3faba4. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T01:39:25Z), 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/SEYOK1127584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6f0b57cacfdd415e1c34f84c55181045336426cab41755a697b333084eedd6. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:33:55Z), 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/SEYOK1127130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75035769fd903c6db322bd2c414399711f9997091c19e15f278a410720d7b34a. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/SEYOK1127132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ce3150709b47f5b3ebde44b0e4018505d8b5bf60d9049ae27e47ec72c595be0. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T23:25:28Z), 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/QZMEQ2331916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee2e63dcc723d6efad35ad06d14db7a5f94dd8d69c42b9a137cab7cf61e153a7. 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/QZNWR2454887.