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 0xf60a32522e0af6779ea4d2ae180f3f1e9e0a117554002ed3b59076a29f660bf3. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eae6a69a-de59-404e-bf0f-7d5d9aaee284.json and https://artists.proofprofile.net/proofs/artist/eae6a69a-de59-404e-bf0f-7d5d9aaee284.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 0x2e2df8a2922c0bbed4a7478089ef1931e9865a05cdda18a28f6a1aff386d2cdd. 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/ESA012587985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33c49acf3fc39f9e950e57e66a57ed2f63c8ef85dc12498d334141343477d255. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:49:39Z), 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/ESA012587986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85304f5e55b351a23753bd8685b0fb107d84edd5da86fa873e0bcba3a6b4806a. 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/ESA012587987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1d6029d24a463ec3563b47fbb3677c169c6852341b5801e7b1f2b20f3b1b53a. 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/ESA012587988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc357a991e55479e7fb0f7b6455a7515c423c993eb960b56bf4118717d70015da. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/ESA012587989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ad66d1248cb26e987a634624ccca2ba2a2f414a18660e393d8a200c5a2a0bef. 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/ESA012587990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73c042ccae1511b9d4c6a40b0d90924a8c130d573e1646f57a935591dfb92f99. 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/ESA012587991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9054707b2bf7d8262ea1be62dd78ffd8d3815e2cb0396073e6f410e410bf49d5. 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/ESA012587992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b0b96b5f2ac866dd840862eae6194449ebf104d0e8dd7c35f6040927cc3f0a7. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/ESA012587993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8f6f05f49f5a40e587e52f516425808366fb350085f74c83592225984e31d99. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:52:51Z), 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/ESA012587994.