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 0xbf1cb091562914237b1d47bde16a2c373cc7fa9c3205b9b741119180477c1639. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5d8c2889-fdd3-43af-a635-bd13aee405cf.json and https://artists.proofprofile.net/proofs/artist/5d8c2889-fdd3-43af-a635-bd13aee405cf.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 0x9a3f91ee9a4f81a42159c6c4c7e70d2d07839f1e658c9445d807c95a7540d9b3. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/TCAGU2393849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb6fb3ed81fa2bf4c3f2ae4ddfe87527afd04efe64e538544c85d3eb76d1f1ab. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCAGU2393901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x136be25d1c829358194b8c3eb4a00afeb8ac5a4099fff6bdb349758a70caa87f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCAGU2394020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2de1d4362298dfd495f8c96d25a87777554c64379ff17ff7b84267378950a02. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/TCAGU2305451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa530db452fdf7f639f7120dacde3b202af458b6170d37c016d0b116fe489db0. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/TCAFK2197960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x602d79b49bb34d895f13017dde7f9d988dd2ce03e74a5ea5394f12303cfa3c0a. 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/TCAGU2394184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc17833b5ce295fea3da92ea4595ef892f025f06b4b3040145d43c7ad1530fe8f. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/TCAGR2204225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6eb867c20b0d1582357d7dc3041d738e5167b59ebb65446b1dba5747d514221. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZMEP2451450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5970b28c54ad8873bb4bd62ad2c1a282bd057786323e347a5ff33f906ea8086a. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/TCAHM2397768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2de1d4362298dfd495f8c96d25a87777554c64379ff17ff7b84267378950a02. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/TCAGU2305451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc17833b5ce295fea3da92ea4595ef892f025f06b4b3040145d43c7ad1530fe8f. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/TCAGR2204225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa530db452fdf7f639f7120dacde3b202af458b6170d37c016d0b116fe489db0. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/TCAFK2197960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fb6a5c74f8f05b2a1dd3b6254e1513e3a8ef9a38b8e4ed6a2e5d623b67738d1. 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/TCAFE2035034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba43343b3922bbaea14a91368133f7b87d75291fba0aadfe4acd470482c3b0e0. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCAFB2084514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e9bebecabaa6afb63ecb395ff3245ed21a7f7bb21cd591eea81edda14c7634a. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/TCAEY2043507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc78d3bfaea5857755e40ebeaa4b104fc8c55d23f374754cc91df87bdd69e2129. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/TCAEN1942100.