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 0xefd8e9e0b57fd61b96856d86207bb4833dc55a8eeebe169061d1d970b46c7c81. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/aa984fd5-884f-4ee8-9d0e-e5d85795e2ee.json and https://artists.proofprofile.net/proofs/artist/aa984fd5-884f-4ee8-9d0e-e5d85795e2ee.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 0xcbfc0e0beff2191610ec942672af9cd4c00a46fe64c767a837ae6844ba07fbac. 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/QZHN42456023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d88cd4d03c6a59d7b214d68698824e2cfee809f01ded091d899c1ae05940df1. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/QZHN42456024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2ef8d568a7cbaefe8d1fbc3532a4827ee5b70d7d260a3fbf172d2d5a84c4ad9. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QZHN42456025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4974cfa94c063ea0c5df0c562260e57fafa9b866cb7c3f481b4ad95a2b03a007. 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/QZHN42456026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce7eabf9094998e48dfb95ca61f39d346739b4ebc03bda5b6c936658033db0b3. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QZHN42456027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87554ad634e6f6fce545ae1494032f084d67cda19ac6b649e7eca349dd3083c1. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZHN42456028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc4534774aa4eb247606552c7ed324ecc16d1753256d688ab3a6064b32c11d1a. 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/QZWFF2408636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaea21849b760da619747b76f943a0afa801a8a225c7e32b11688d3ec92e60a96. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZRP52447347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5130a67d03f9048497c000e6a2c5987443a92b534ff960e4dcc8ae2b80d3cb26. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZWFF2408637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fd623d467922bb0dccb7ebca8aed9741df8ac30c1f62c5a9e7dbb224da0e493. 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/QZTBC2330390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39c3ca4ef3a3a37ac1f3b7b0bcb37b1506651d5a83d221ac034df898c97669f8. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZNWQ2447946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc965e624471871bfd1abcde5ae0521186e6e20ce740ac27cd7beb7665a3dfe3e. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QZWFF2408643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60b4ee9512f24eedda2f69fc9fd2552ae01da76fc4d56fa8a9a30776b8e263ae. 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/QZWFF2408646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb842f4dff2770a8f42098fdb7d8e2eb9aa388ba18ae0af5c4ad7053b98337e0. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZK6F2322611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39c3ca4ef3a3a37ac1f3b7b0bcb37b1506651d5a83d221ac034df898c97669f8. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZNWQ2447946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce0f5f738740a3d2273160edbcaa3fbfd3d729a5c5a1fc6d5f592f156b20ef65. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZDA72400877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbca60dbfc4fbfe0d6ab4c50e4ec7e96243d0972ef71b034d349794d3795a052f. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZDA72240804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2b618372f42921ccad8b1949562354055d70a5e260ef238f6a274e210db0f05. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZFZ72434820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0fbc36bb9ebc0c2f6b6b30e660cd2262ca80cd371ab377bbbd5a7dcbf712567. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZFZ72434828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe24fb84f5baff8937d794c2e956d7268b4c6951a09dcbeb7f98c5aac5279c7b0. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZFZ72434830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb01df335b49baf27eb462fd85ac0439e59f39a5fea2b45dd910fbdd2d377ec1c. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZTAS2490578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5952234be5b58482481d49605cb5727c25f7f065db236684375e52f071be836f. 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/QZES52364408.