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 0x8006217ded6b7f8207c1fa514f37ad227d14dd1cb6fb6d779ce8ddadc3275fe5. 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/db4d6b72-2c8e-4b7e-8e12-e4094f262866.json and https://artists.proofprofile.net/proofs/artist/db4d6b72-2c8e-4b7e-8e12-e4094f262866.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 0x03ff83e47ab8c09ac91626bd41ce7452532868b42c4623b95a32b796b0dd844d. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/USL4Q2389385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a967f6981c6b0d6465851106633054cccf073dd785bf10687dadb31a8f91edb. 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/DGA0Q2339359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c5de97b7f0b3f1d0b45343fd21c94d3b88e56f22be2281b7b3d0d0c7b00455b. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/DGA0Q2343162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8129279b980ead987143d6ac385627c3cb80d04c6f2368796df6f16f42073061. 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/DGA0Q2368665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a206fb3e1c77bc0147269b1aed3e7a3e59607e4c0a7ec9b44c45337c38a6ffe. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/CHF032509583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2613e6d91df48cd4ef45086564c7fd5b03274e2a78fadf26f799f931f2c44d98. 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/SE5BU2530031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ea17d8f8c188b097cf4311e56550d4ed5aeffad5ce675e6a1e8ca8f37ca8e27. 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/CHF032510273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03dbae1a25ac726064e42fb3572bfd34b1f122c633a00ec3d0e020f0f5038c3d. 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/CHF032510274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a206fb3e1c77bc0147269b1aed3e7a3e59607e4c0a7ec9b44c45337c38a6ffe. 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/CHF032509583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4715287693389596c5dae6d0f159fa7813cc965febeb686630fbd876ad122eb4. 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/CHF032510275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba79b939e110caab25cad66a85b1a15a559b291d90bc0aa28dc7472e21b0d863. 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/CHF032510276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce02cd37a5ddf43dd2cf6171bbf9bf72892fcc40fd9025a2b4220e9949329208. 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/CHF032510278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x011fdce80fa45aa8e066f612f0f1e6d4c71f44b6d1a72a7fe149602cd215116c. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/CHF032510279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9033cffa3155fab5314aaf55b7f5fc2710c0ed76548f2e88d0d14b1b5d32b36b. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/CHF032510280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61e743725dd6422e3cf675c3aa82e20c8f73605e38a9a46c8a7809e60ac3c833. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CHF032420677.