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 0x1df93276cea6ae7dd598a70b96a154f0f3786359928fc3f4623183cecd8e3be3. 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/770952dc-c59c-4c37-8c5e-f60961a3bd1b.json and https://artists.proofprofile.net/proofs/artist/770952dc-c59c-4c37-8c5e-f60961a3bd1b.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 0xd495ac43aa278f3546c45db611da071a340179be5d89893e77073f45854d7c10. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ITG270800018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x681fc2c3b2581ccd4f087d42731aa174955ef4e05a1080f42473847671a5ef56. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/ITG270800025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71eff7026aa967eb071dee4b6ae0d4ea4d556f5adfe3a60f607769a9d98ad7c0. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/ITG270900105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86b1afe2cec74289499f8890ccac5e5fe48fb96679ab07c6e38c1157726ff890. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/NO0LQ1801591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd3b2e8c3ed162fd42d5749f66db2ee707f7811824db158252352edb04de48cc. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/FR59R1926197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95e027217c53cb0eb2119a4dd695f478cd5fd9f304f604326823cacfef5d48be. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/FR59R1926198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x983f60e526ef87a02ffaff33edc592808e43fab25a1cac8b8c980eddad9f89b4. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/FR59R1926206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ed37f911bf431360f0406ff74d19d73a5f759ecc196f0bb80a2b383906a8773. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/DEU602310368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95701903fc217fd74b86cbd9a21fb9905395a0bffc843d1ea5e2e9efd5528a39. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/DEU602310370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf34a422172711653fc31e1f7a34ac6d0d1ac0cf27083b6c3726a80a1936cf1d2. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/DEU602310371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9241d907d7b46344988363c71219e89766e68af608e683b1ad71ae66ae6d7700. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/DEU602310372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fe3753e118cc1556a6dd97ddec6855c70449a9990a8dce2eca2b822a579e032. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/DEU602310373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a9d2423c8b882ef449790c8c37e41d712b96efb46036b4048841c0cb2ece875. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/DEU602310374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x522b9d7a993d5c3f068fa19668d9fdf918417b6c70782a2b9b7229978cf96993. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/DEU602310376.