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 0xb1156cf4752c154c138e28cf133cebeff788331a25d315b5ddf53cfdf5966b13. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f111ed53-182d-4c4a-b164-a45c16d70c48.json and https://artists.proofprofile.net/proofs/artist/f111ed53-182d-4c4a-b164-a45c16d70c48.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 0xf25b508ab6cb07c0e3656ab9050f6b65710c1446999293bab69d28170812f384. 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/GX53U2466084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f2e76a0a040046e9dddcac86047c60596be2b9363cf8c0572bd64b35d0c0147. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/GX53U2466085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15551473aa01c93c12a31a50edf14716e0cfd670e781b572a332f21eaa0e27f0. Chain 2 (Bitcoin): anchored in block 956425 (2026-07-03T01:28:11Z), 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/GX53U2466089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb8c4650dace0240ac42e289d38ebb6e349a871d4a6caa4af995e242563c139e. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/GX53U2466090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a22bb40de7b1130538c1e9963f876a9e3d0d8ad374ff643d249a31634d7f6e2. 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/GX53U2466093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2643d1010947c8ecb7036a5c14fdf8761ade10c6dab3704dbdf993d116f22ac8. 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/GX53U2466094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x173623f1b52ca5708780920eea5a11eae2f5f11f971de5d672ed8800d2b0d440. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/GX53U2466095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebe53cd8ab0b4e63cfb82e696aad6c72be59c2ed43477948ee5ff6fba84b7d41. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/GX53U2466097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd0f8fa57921a84c2df2fa5dde7d7ccc60869c294792c28a70cb078f5de2511b. 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/GX53U2466098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70d6ea77b0dbbabbc37e19ed7bf6743ea70ad659f49ed10560f28bdb9b5dcf95. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/GX53U2466099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6768fab476a0d644d51873b2f5f044f39aab5b4cd1e9b50521be7e977ffe505. 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/GX8KD2582605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3db9cdaf9525b208d2fcec936034e62b1888f66a53251da39db97c6a4ac7edb2. 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/GX8LD2571571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5c90eaee7400ac26dd68bd8612fc744f9f6c565ed22cdac04635b7420b577dc. 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/GX8LD2514310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1bcfc3db7aa80f154d24e95c3136dbf91419a2b57f1b63076a11894ff1f5585. 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/GX8LD2505627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14a053e6c30a1cb67bb74bff24292d18bf87c5391b9c8c426e63d2f1bbb8f060. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/GX8LD2517076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c12f3cd7f8d1500188e936b6fadc091f73cafbc548a933578c772ed2baa2f3d. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/GX8LD2588339.