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 0xe804e7b2112c1fcb74bc358e376e176b0f98930e8feffd8863807ea40d1bba8c. 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/d3955da5-a500-49f2-97e3-6d7dc7afa383.json and https://artists.proofprofile.net/proofs/artist/d3955da5-a500-49f2-97e3-6d7dc7afa383.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 0xb7537bfa493b939ddb197811f8887609149a44cc14d65306593a97ffb08ae13b. 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/ITUA11900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe65a11a3419f16325c26585a9ef8463ad98c019c396d484e695c37ea8f86e466. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/ITUA11900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2ff1705135984c946ec2166fabb29d3383ff0c528c02ec4021b26ebed54d6d4. 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/ITUA11900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3be7e4d10d08be49fc204b6a98d8f13934a1ca33537cdf67ab1ae110ab15fb8a. 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/FR96X2070729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6085362a206fac6f481adcfaace473e0fe7e7c93c2a007c9d724fe7f7b658088. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/FRX282079760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dce7ec3ac62a7dafc02e793491a64e59219a8a8328d14a54c4f4b5174ebda3d. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/FRX872038619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5140c884881ff894b1a55efb85f21b0d18923426c7643010be5d61fc0e1c1bd. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/ITNXV2000035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6826a646b578e2b790b6664fef8024ad0b3edcc9165b4f17011bc6d62b8c3ee1. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/FR96X2137934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe0d1e0c875e92f0bdc904c60a2465ce65a472c24b89a8033c5493b48c3fc64a. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/ITNXV2000086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a5ac64e48597f8a419ad140add8b0a935a2d851928cf93374526914a0be7ddc. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/ITNXV2000108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f630432d7a422415cdd0d24d858067fc5a214457f6efbcdcf9522087ae5a083. 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/ITNXV2300030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc038c58a44d612cd2e8cd5056a020d6ed090e5fafe278d7875d7a373a88b4ad6. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/ITNXV2300046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa01f5bfc907641371da4d49858a7b8e7bc45b75d8cee14388dc87a4a397018a6. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/ITNXV2300052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91a556129c241339369603037b346e296eddf7052eb7d5df88d4cc410bb79a4d. 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/QZWFM2317145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57cff7e7a77693ff98a3557e54db817de152917b0ba51598bff4488d36b49e28. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZES72480362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x878d8d0219c5bf3cdfd1566ff78054da83d99267e64d8f5b32bff05e08a051c5. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ITNXV2400047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x921f17b4422b07162d16bf985a4aff36c28162c1e8c8e5bde3e2dd9d28655ac1. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/QZTAT2593165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x431e8649f3cba3f15e608004b69e8ff88ceaed39c8d7c3552a63cb6449d9a898. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/USA2P2337787.