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 0xf35993ae3568d32aad247d8fa9357f315c16b600530243e28f6f1bf64288a2c8. 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/5bc86281-60fb-4cbe-85b0-ea15fd334f5b.json and https://artists.proofprofile.net/proofs/artist/5bc86281-60fb-4cbe-85b0-ea15fd334f5b.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 0xe90c3ba905e6307dc09d23ab14e2f8cfc0920aafafe8b6268b8b9e36a50fc79c. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/USHM21591929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x978ea27e9106fe4ffe79c2cd0eabe0dd90eb370c2a617a10fb433b036a0ec29f. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USDY41657038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95d48fc51a33c447ee4b24acd00bfc2fe42df1764a9ad5fd1527c820a3ddba78. 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/ZAQR41703177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaf0a56f10f6636441725c3328d2d21ef6c57b98b4ebc58bd6b3d10a1c2e68cf. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/ZAQR42004270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05a75974bd36fa332b16ea3336629908cceffd1346597ac4a7e2c978870f4eff. Chain 2 (Bitcoin): anchored in block 957526 (2026-07-11T06:03:28Z), 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/ZAQR42104365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d9da986fc82efbdc1b221ab84e47e456e63dcafef74eea4b41f47f8099909df. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/ZAQR42104369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d24c31897e20831eb16cd89c338a74b9deb83f7f2f27dfb0b0367698c85839d. 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/ZAQR42104370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ba53d6709324262e01294b78d78e76df017486b4852b9d3fc6d26d8e35aaef2. Chain 2 (Bitcoin): anchored in block 957526 (2026-07-11T06:03:28Z), 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/ZAQR42104372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ff4b2120d18da56665fd33114a212026dae1f0cd14920e8758410da3fbf05ea. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/ZAQR42004316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8ee51e7b7a62aabe090a0bfbe4949f63fe58530ce0b8ec25d76cb470796b410. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/ZAQR42204793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8359286c8a30512a693ab5fba064c629f960a7f231c2385b13649414e21a8992. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/ZAQR42400984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70b94c0ae3b92c3bac9f4807f55a6854eedc87b443fc55ca47d11a257943e123. 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/ZAQR42401035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5f17c5d7f3a46e1d63d20ea58323fbe2b605f5628603b082f9f70b160d2b6cb. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/ZAQR42401074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe03182f115fb8079ac984349401166edea8e59c206c8858b26ae09137297c7b1. 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/ZAQR42401068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5ca9dc2c19c20e8e75896996cc6ce7b386b529a4e637a2348db86e994232261. 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/ZAQR41803326.