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 0x91dbe0a728296d5997f903d55d5d8ad6a177cbf7f3e6585c379c7b1b498644d2. 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/ecb9e006-929c-4609-9f5c-2173fa1b50d6.json and https://artists.proofprofile.net/proofs/artist/ecb9e006-929c-4609-9f5c-2173fa1b50d6.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 0x9c57605fde163ead3be41ecaf99991ffe2d1bf7246f0f184a1c6f579198d975e. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/FR6V81208527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x544cd5dcef2059b6d301f8f1e505014ffbf8c7ec4fb45daf701562250579ec9b. 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/ES71G2113933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x544cd5dcef2059b6d301f8f1e505014ffbf8c7ec4fb45daf701562250579ec9b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES71G2113933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dcc63d0d5acc2a84e7cfd3eaa9a7460b27bafcc87a345cdc9cefe870792696b. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ESA011847763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95534b2a4fa2e7537537f2165eec6be07008deb7a8c0d996c83015b378f1c3cc. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/ES71G2125028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10c989779ddfc807d69104c4b2e30677cd6a54c9a4c278e2b12784b1d76ddd6b. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-17T00:54:14Z), 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/ES71G2146025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eb470b66334c3d11509e6055b0885bcf97715de4ce4812f80cb7fe0b8f1a39f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ES71G2146026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4ee23107d268ff56548ea8f6800e4c7ee653ea3380908940eda1f37138ac722. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/ES71G2146028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7565978a183ad5f00b2df67b64685e221f5c614ef368472bc0cca2e8c3d13094. 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/TCAGE2244393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad5877799db53b408e203dfa2936efcaef7e406bde500b76c255b28db10cc4c1. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:17:29Z), 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/TCAGE2244402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed678cc1dae93c5188af96b75640f40d63477dcb816a32fa9b6e3ca679a34ae5. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAGE2244427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46e307821bb445cad26f5fad19c75ee61f497f50edd9b2b81742d65ff8f1679f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAGE2244432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd4de4150bb4d18bc889ffec91f1c0169ca8e1b2d11cff294e1b6b98887e2897. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAGE2244435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc96180797d08745aa466cb0ce68c71ab21f9a011929f8e6892988d63b1e46b4. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/TCAGE2244437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x588e5549ba010f27a116edf146951d6496aaf6aaf10ddaebe2ac85f240a47aa6. 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/QM6N21995936.