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 0x51a356d1bfe11039e28ee2dba9b4e913f2a21127384d23dce10f64a38e24dfcf. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e513768f-5010-45b0-846e-c10e4d5cff23.json and https://artists.proofprofile.net/proofs/artist/e513768f-5010-45b0-846e-c10e4d5cff23.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 0x03027a2b9fd54c15dfd8f01a5c845e9ca4b3e5901c518f015529ecd45c04fc51. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/USCGH2176217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffc4d3ba6e42f5804905930efea358943eca25b053801118d36092763a023a7f. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/USCGH2176218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4ab0c2d6e513b8fb8caf545942ee8b1036ca751605eb34660a1eb2f9d044367. 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/USCGH2176219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x116ce733ee550958a718ededf03248b86a7d4e27b09b263ffd6a8b786c8f2bd4. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USCGH2176227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4554add3e93cccf0a2fab7a4fed2c98301c7aa21ab03f00d6c900a9921a101f0. 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/USDY42310775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2562f9f7e20bf92393b7290375560299fa62dae22bffe5249a9b9aad9b620a1d. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/USDY42310776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fab36c69ae9173c4bbeed84866c21ff9cb9bd6dc5779601218e0aa300328036. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/USDY42310777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18e41b4d97c76e0edfee1762031153414bddfeb8e9dd9153c8c295f4b0f030ec. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/USDY42310782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0709355702aff009da1e7e0ec0f28bf524338c42fee8a6717c3ad101b3718ee8. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/USDY42310783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfd87134f6806379bd887d03d9a20371c631353eb586c4b28cf65a0e9c6be84d. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/USDY42310785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4146fc95f073e7b8dd82975d7a216e051cbb92e62dfa2fa5769d42c7491a7c56. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USDY42310786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafe32ba310a245210e1fe1bded204e6f2da90457eaf6d98578ca1e09df6dcaab. 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/USY242444780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaad966c123d492d3ef8f9a7c1b66f8f4f8762b41d43ab05c7903df1eb36c0b5b. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T00:53:33Z), 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/USY242444782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a64265a8056cf7bdb733d5bc04bac2cba34fe00bc0f24215b3d96d747fc05e4. Chain 2 (Bitcoin): anchored in block 958722 (2026-07-19T11:03:50Z), 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/USY242444786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe00acc70d9f707e4c964e7c3138e97a360ead1bbfd57073d52b1b13585a45149. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USY242444789.