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 0x37fc8403ebfedeb49da096e9cdb0f4b902ad0d5f9d4505e20b3dbf179d46f6d1. 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/9b379c23-a91c-4b7b-be6c-bf03521d12e1.json and https://artists.proofprofile.net/proofs/artist/9b379c23-a91c-4b7b-be6c-bf03521d12e1.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 0x808f58ddda39a145240f85cfcf2857833da8078938d5d6f720881522a17b26f2. 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/QZRP52576580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04021ed55e63cf7fde96fd27cc15c28614a45431bd4d73fca5fe0bec8fd99c97. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZTB82553505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8de9bf5288647f2792f591cdb6819c2a7fe951fe66d639f4643f91e6f0654c3b. 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/QZTB92511670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0af695e24955e31b653026772dc9697aed9abc17f732c7704766fa41de1df7ca. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZTB92505927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c29d68ebf35dfc5553795b4ca30aa54f05fd0b130f40f22c74e7d52cbe08b33. 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/QZTB92511593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c6f478fe4899d5d888c883557fa9bf49bdd6de127ef7ca0b2710187e994ecbd. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZTB92511654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf51b52db2c9f7626ead54d94c6f82540e56edd44a450421c95a3dfe8abc77084. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZTB92509414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcebe0edfdb0f0ba0c05f5bd19e6c5c0d6d8b60c8ab88d4fa96fd78dfd170f1e2. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZTB92509017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14714f31ca104bbe7a952850e3dcb45569b546cfcf3cdd3a1dfc10990cdcb84a. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZTB92509149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ca3bba7ab09a2803ff562a4443f094463e6ca5604d7b7db263c40c1182219ad. 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/QZTB92509103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5f7588f20aa37f102950781d9540e5b0d04b4e3414b268be81da91a16800519. 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/QZTB92509064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66e1d7069934c60ca66d7cee801004e8e1e6a3a553aa1e97b36830f34448fc79. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZTB92508996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a722f40a9dadeae84ad5e651d33d074ed14deb41c2e6c72e2f49a7647f69678. 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/QZTB92511694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd8930fe4cff8c41f507114652bebaa29905a3bf736e6bba927fdb2b12768e15. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZTB92511689.