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 0x071cff9929f3b79c3e064ea4936ad8e9744a59aff8453fe5023c2ceb4231e42c. 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/38abf0aa-0bae-4cc5-ba91-40e61cbf1dd4.json and https://artists.proofprofile.net/proofs/artist/38abf0aa-0bae-4cc5-ba91-40e61cbf1dd4.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 0x3a5be7807b85a47dda12896e3c05b71fae5c7b5f1dddc5fce89bf7fac3b3d5cf. 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/QM42K1968389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10fe60cad7db35269936231c35d08148bff6edf937b00ca92adc5e549e5e7838. 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/GBSMU9343363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee810ba3c1b9e7d6e9e4fc7ce38f2252ad24b9e9c843e01767ed3be9ae0ea546. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAGF2209590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x880df889d90a8b3de04450997c747784c672e528e4c47292dff172b1cf9e8265. 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/USA2P2229871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdc638431b51b45faa83ebdf6af9795585751578351f5ddd0bd19a6f60885bff. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/USA2P2229870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18cfbc860d947ee4d5836c2aefb4e174e718b55aad45867cbf7161d3fe9252ce. 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/GB2LD2210384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9af1432a39cfb3ea033a0956d1061f84cf1949d0a5ed923a4c1dd7f60932570. 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/CACWV2370902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dbff5885a8919b18beab942c21ec2d16bc36acff31c44e9d0d838d4aa4ba1f7. 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/NLUW22302120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6518832ce401802c7c856ae4dc63490a6eb18c8975ccdde39e364229e354ff4. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/NLUW22302121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e11b1caa50e06a6709aafbcd1a9d1c2735349ed4d8229f0f64607e57a07920d. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/CBEYJ2481845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04d2302609190c58cb81aae62141a774d46f74f23167d71df6d1ca583171d6c7. 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/NLZ542201101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8f3772f057a6019478d2472b5b6073044618865b5573e7bcf9afed87ec5bace. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/NLQ8D2101542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x607c8aef048e6dbd93980cfe53cf34afcb30c8e57f0e722fcb771db04fdaac3e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GB2LD2310038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f525599ba5a4ae7413f2a21f914328ed8093394d39386c7835cce1fa7f9d79c. 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/QM42K2166365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a09e1b32e291cef491e13e6c0342bd26832aef4a0f97dd0fc9b2f916742140f. 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/NLZ8V1800226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87782c5ac6cca14e4c3ed0adc916be0807bbf214ddbaca10631b16a72d9b01c6. 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/NLZ8V1800227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x344ad4b82c9cf36f99bb06f9da8551f0bce57d11247a3dbb7e406d506563bb7c. 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/NLQ8D2101428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f6b4968d0bfc7cf4ef8fd2f8c61da38d6577f19949cad9942d51ae395c49332. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GBSMU9144894.