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 0x53ebfdb5cbfbbe57a0bfef92dfc18c17859f723e3ce419ad250de04d53d9e921. 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/2fb4ef15-dd56-4808-b942-96c7ea62708b.json and https://artists.proofprofile.net/proofs/artist/2fb4ef15-dd56-4808-b942-96c7ea62708b.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 0xbd77d6feba8ea8ebe817a27029bae783d987c88529714654f437192e03bd057f. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/QZFZ42112335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x727c5ca9005bae1ea92738b746f5fb8a417e732fb43e336dd60815b697828ea1. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZK6J2266189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x631aa1ffaa1610513a709f364b226f82d56abc8a66b0de790ac230e6d51f213b. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QZNJY2441765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ac155b252a6852e81d8369f291a2e5b4a41a6de5ce74ec68d2b343296455a67. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZNJW2311072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x212333d9f0bc6129d37623224206b7196197fe4d0258f12e5c755213f4387857. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZNJY2300471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cd821307f15c9539c5456c2c44e2a37927f1e0e36a5eeab04ec6b7c86d570f5. 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/QZGLS2478758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4b3a87f658e641d3df3a8ff1d8507fb4aad74114e0f78fa9845b5eeb96065af. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZMEN2463764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93f3e666cb40ce33c3f16d5d0f9fb8b10dc8491c6fc92c9d42db310140ef474e. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZNWR2460420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec8286d86e7302abefa163f58d95540369616cfa458be57d891e481cd35532f9. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZNJW2554068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a48c81a653f01d48f4f19feff55ae3dc19979f487ec1b158d6724ec366b4b7a. 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/QZNWY2406890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68a96c31d409be822aa15f8fac71c4bf1ae67868cfb9c7c137d7a6563e439029. 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/QZTAW2492999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x608f8d7b4907e6f83cb62d9431d02df1068969b7fb195cc01d1d5f97d157b478. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QZTBC2452234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbda88b6f6be3b913680377498160129b0522f3d555c82385a3593d337c667bf. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZWFH2404895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaf7a19c2aad830fe2dfa5162528d3c938ead897753b7ab91c13309367536a40. 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/QZHN72556080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8a84120f4483f544e1f08f1fd6bf65a1b797000e28489fa3d25265a9823f84c. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZK6L2518531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8338fd56fd60fc43e046437ddf9a106b5b04b44c9dc347cddac2d55d59c04175. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZTB42567742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x319c037b4a9a16b55fc34b8246b0027bdb7f18b73add43db9d6a4718b69ad43e. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QT3F52564836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1876a77b00e7c4862aaa4df6a034245bf5eb71198565768d9a5e91d4a4e3b376. 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/QZGLS2468124.