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 0x0c1c3bd446c907372d8e4c789a16861da7dea4fbade7e36f751d7376771f98ac. 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/55f78809-3a0a-4152-af6c-aaa8b9257dfa.json and https://artists.proofprofile.net/proofs/artist/55f78809-3a0a-4152-af6c-aaa8b9257dfa.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 0x1de4e47d0c091b584e564278c2c4eb6effd0f4b2ec32fc8ca125215026d8e60b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTV32414248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0fd0876320473d7ac06baa62e94435899c0359d10494d34f3b167049eb3c279. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QZWV32442183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45d921a7a0310dfcafd5257e68aacd48393e9bf116788da0c0321b3cfe9da311. 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/QZWV32477887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45d921a7a0310dfcafd5257e68aacd48393e9bf116788da0c0321b3cfe9da311. 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/QZWV32477887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48a14cd82b7891fe18646a3f181f8d2ad241c8cb334ce9031c3475b0a1d4a322. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZZ8A2438874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0c79e5a6e013c73acec20c726b9341bf0b4a215774bcba1e86172b83fcc7786. Chain 2 (Bitcoin): anchored in block 957210 (2026-07-08T18:28:05Z), 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/GBWUL2489214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd833ab94f7feb0a5100252c722949971f81b9a37a6a5f1fe22eb368dee8af294. 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/QZTV32416627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63ee10f1946b283c944947672fc1f15f1c88af8b9703cf2302c6bf91fcb18c2c. 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/GBWUL2463100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2756ab4b187576a4ac895adafeb6c47696b2dac3cdea2c7b8261fa673e63696. 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/GXF972417161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bc21b53cef984c88fe6d8950fa016129e77c3cd1d2e3f889ced19ebd2ffbac4. 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/GXF972440795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58152ff16226927ba89d4de52b92714138920734f41dc04d368791028db7b57a. 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/QZZ8A2429885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9d0f561fdcbdcb269570619705d5abe8cfd0863dd40b3e7859b1110777c3918. 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/QZZ8A2405119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39fc2fd0083f7e4f463480bb44f73d060c0afe4286c159353040d20c4190a314. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/QZWV32468543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf5b4096bbb63e504f00f3a203be33089ad153fce4cb1dfc2716e7372aca301a. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/QZWV32470428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63cf2f82a1df64542fb0fe1d39921b3c790c61915615ddc5d01067d74b07922a. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZWV32477958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8441d81f70800e392332d5557efb34579c438bb33a76fac337fe3702448dd1d4. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZWV32472976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd936e8a0222ec1db3def672713c8a45c2017e8a55ec07a9bc4bbe760240d863b. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZWV32464156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd2d8546c5c50524c01cca826df18d61d93843c710595653f1e7c7a39f28c9e4. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZWV32458583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28506a072a4aa863e8bcae449ad84c5210fe7e473dbaa8b2924bec5455b839b6. 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/QZWV32461243.