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 0x98571b20571d74c7eb197df8df82dbb9f26a6ec45c623f5feca4144449ad2d3e. 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/4d8515d5-9ee0-40a0-9e8f-7e90b0868374.json and https://artists.proofprofile.net/proofs/artist/4d8515d5-9ee0-40a0-9e8f-7e90b0868374.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 0xf7d2b75194e779c9d306d9041dc29f2bf96d95fc7f07f1826671a976e380ed2a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/SEXGF2491088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f2866bb006033206882dca96e559ef347e91b9f1320a3e4bb65361a4295cacf. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/SEXGF2491051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58c4a82797131f1cc3c9f7f310c2f4c5fff9c11697ba973706ffed97c66eb582. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEXGF2391120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5566d19d44b66303d334fe07f7b00640a6ff560e08636aaababb64c8558ec116. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEXGF2391015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bfceab6401abbf52ade9b3f940fb2d302bd45f79726bdc8cb1b25d92a3c20c7. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/SEXGF2391001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80f7ae06b452ba645db4ba355bf1d454c61c86b1b98554d7454435feb3085afe. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEXGF2300560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77981eba3551d247893355724f5cfe1f1fe48de39e41d1295e2f00d992ac1d51. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/SEXGF2202259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b7c1f71d03b1c6e1b2bf2f6db18f429d934b092d15517d08ea025977f866e61. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEXGF2202247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69960256e2326f2da2ddadbf2b06a4c969e3897e7038009d3c38b41a30f77592. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/SEXGF2202255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x083d5f734e64a0e7e33c28d61104a33399f27444c7d131ebd4cfa27c1b320504. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEXGF2188901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa933c05b42c34f8ab937ae693453d3bc4919585ae8c3b38dda7c2a036707dbae. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/SEXGF2199431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82ca515ad084e8e940ed04910758769b959f4b39e816afc6af4504c30e154fc4. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/SEXGF2199432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e3502ec926a33f7d3bc62f605135fdabb0eed0b9b8f19110e9d5270c2bdd869. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/SEXGF2199433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe88d274b3948ae79725fe0722c846ce089349e0cdefba36d22c2042be894eaa1. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEXGF2175501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4fc65d370f1cd21f7867764506764fe9d8aa05b5a64ace46bf858e374d2d1ae. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/SEXGF2137301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50e05c8a434242ffafc09ee890d92be51f3413de1b9cd36636c2655030ac4406. 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/SEXGF2107601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x598b3ec41464dc292ddddea1f29705fba8a00d6380498004e097202359bedb4b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEXGF2025401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5d571a1974b1f38160b5524b7410876f40e9537a098de0afc45001610f4ce49. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/SEXGF1907701.