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 0x9b42cf04736749a8688a1c7ea557f19d2f2adfc17749340ec5caf8577cadefd3. Chain 2 (Bitcoin): anchored in block 953707 (2026-06-14T23:22:21Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7d743e90-6afe-46a8-9ac4-0b91f8363330.json and https://artists.proofprofile.net/proofs/artist/7d743e90-6afe-46a8-9ac4-0b91f8363330.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 0x0aea76c36e1b5f7f6432c9c57bfcc6f18db3672257666b6aeccbc3fe96fab5dd. 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/QT3F62523510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2916ead9e4c5e3c2f03f1e77b879de02bcd749e7bd90822e1d4f9bebf85f3c90. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QT3F72564214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecfd7966d284637aeffddfa402139cbc212db2b50c4630d7b15f9952a94167f7. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QT3F72564433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8484dce9936411cf23729f322079689f9e0eed4e3dec5389300808b8c6259d3d. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QT3F82574475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36fd5844cbb888f9cf743a31a204cd51bcd3e4b7b5f33371d0083db23e568c24. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QT3F82574409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8757462f93011d84facee9275dd1e537796b0f9de470ca8573888c3bbe93b00. 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/QT3F82576812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1753cb1eb23deec19e109732f212d5759b19951601defc0378a0e374c0d25ed7. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QT3F92560857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fe4aa5b829985a89527cfcbb014247d150bd0fd61106f05aa0b8cfa47937173. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QT3F92560866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x937483be6866c26d3dcce86a9a477678156544ec47d87b58f1404a3f1f455059. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QT3F92554871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5cf787c7fe87d7787253f485c3018fcc6eb5084e36d6f4e3f99e5f8ecac7615. 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/QT3F92560833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x222d32362ba6288e2bc53551e0eaf53a19c7d60ddc2d064339e3e8eec65fad64. 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/QT3FA2579810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf2d576c71a8d412b57fc4c46d36caba875cda53bb66f7ec601753dc438256ea. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QT3FA2576809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf95f4155ecb9f91092641bcd36865a072620fa8770525884de6f9b5199c5d3b5. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QT3FA2579817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55de1c4e35ec3dbc33bce3d38928ac934311dfa8ee7b6c84fc6f2f85a3a32c80. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QT3FB2555346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4e49bea3e6bd3b022b8155853d6894043ade424b6feac877d9a483ec3244e47. 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/QT3FB2558165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b3dd49e167533d510be4c01fec80f92c9776b93069fff49db51d9def3a636b4. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QT3FC2539549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08a209987266f786b930e9ffafa584e2c8fce39ea6d9f1c27b2c938da582078a. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QT3FC2541907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6a150e30e7037545acb9c8b7929db1af79a6eafe57fba886fe5eebe6fbe22fb. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QT3FC2541910.