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 0x1755f3c71b89342c8c8409728ced68d1c45858ed70cab18fe58b01fd9b1e7179. 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/e65d6ab7-6ffe-484e-895b-cbdb764b0d37.json and https://artists.proofprofile.net/proofs/artist/e65d6ab7-6ffe-484e-895b-cbdb764b0d37.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 0xf609a484719adac4f26087ee6cfff372d98c761872dde3a69af7c49174a1dfad. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/FR59R1637075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x699a509a7b3ce8f7a8de18ea823b2d14c6a441122afbaa5987fa9e47b3dd74e0. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/FR59R1636987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbedb4420467e2061a7daccbecf4fb1132675ec607126ee79af01e464bb8648b5. Chain 2 (Bitcoin): anchored in block 957709 (2026-07-12T13:52:43Z), 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/FR59R1637000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x510903fbeb4c7ae35dde80af4fd1433f1e60cfed1507e759de857372282ffd9e. 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/FR59R1637006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd76453dad8569e479f53b0710ee40eb1374afd98936ad7a29b5db72b5de842a5. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/FR59R1637008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15bc2fd5406cafdbd9f6bfe37b3880d05c9d69dd0220f561f15a71586270db1e. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/FR59R1637014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1884da3121e673c31e3fb4cc041fa033efcd6ed269b2848f820e1a93359bbf65. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/FR59R1637020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa310b66117a519a31fe6471b6057bf03a40462ecc3b53a2616f34ea19b626612. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/FR59R1637105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47c9361233aac85f4efaa6a74b7ea3e8e880f51febe24195703ebeaa5deff369. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/FR59R1637113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7da5f43b4a6edd9db9e6dde4fdda319947a8012ce5a50efb81833d5f687ce864. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/FR59R1637131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb824b86c2dd62b3ff8dbfddefc36b0e5323d0787ffd3f8c6ec6104d5665ae48. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/FR59R1637154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bb5b51f5d8f26e211f4590ea4183c9320704b0558ac10b21c9df262fb166778. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/FR59R1637047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24b5b1da55d298001eb271a2fbbba1673150a1993c40aa05e7f2ab2c950e87ac. 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/FRX282184444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e3689b43a7e3cbe46c50fbe357d36d262e3382edf54d9b03f85508ffe8302b0. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/FRX282184447.