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 0x1ed6a32d2a931eebe0ba8c259cbdd5f7d8e939e5d8ae8fe1a13d03bc001176cb. 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/67da61a3-d353-4c36-aae7-68bc005d6a7a.json and https://artists.proofprofile.net/proofs/artist/67da61a3-d353-4c36-aae7-68bc005d6a7a.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 0xb27653bfa439d28e744f1551a7eedb558f747d8a48228f08b1ae153c29ea1a43. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZK6J2558065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf68c86cb98f197fcca37cf21638044a11027faece8d5adfa5eef1e7755099556. 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/QZK6J2558066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f36cda38cb4cfecca9bd71625b527f21d3b9c67aa6cbe11017203835605ec0d. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/QZK6J2558067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4db1cb553c2c1c82855295a65236ac82b83ffd099f61874e6441cccfde883237. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZK6J2558068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x333a8460ac9ca06591c847bf24d6ab800b378cfa857fb4a97832683400825fed. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZK6J2558069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22a5e5da92310257e6bf5cf1bb42ad3d165024a3dfe8b304044fddcc736fb32a. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZK6J2558070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d3d7e75dbf1cada7076d5b0a0b79697ab30092cb37dfa0a7e4776512cc47c79. 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/QZK6J2558072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x216a47dc6a0da6edead48a7c2d8d5e469d80d9545bca0a74adf8571bc290b56d. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZK6J2558074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8dfef751ea0e453439fd9469aa61b4015aa5670d98fd10cdb471df108209404. 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/QZK6J2558075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49a83a920707f4c6601036b155e0b98f0ec892bed06eb6e6f1f7698e719ff217. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZK6J2558076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeab1916510d9baba39fc157b0787f02f1ef33d6273a83174b161c91310b57fe. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZK6J2558077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaacdde47b08836b8ae56774a78c97823155c3d5ec23e6dbf8d73719b9a64d656. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZK6J2558079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d1aa74afaa5094300c94a56d2d1321952e2723864d6cd028642c4ab8a761e60. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZK6J2558080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x638a593a6923aca2c3a339a01004cc5871b0009ae8d16e329dfa321b9dd3a74e. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZK6J2558081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c25c960cefa60ed819c8fc195a60e9d8b23f6ec2568ceeab8194355b89634b8. 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/QZK6J2558082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70b67f6b7e52a76501afc27aff0339b67a479d38183e74af5b19ff830f62fe1f. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZK6J2558083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x388609edf6da1b4ee21a3da77b9f2e373b2e3ea4b73c3eccd8238a904f09170e. 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/QZK6J2558084.