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 0x5b891e782d028a9a491e0e19cf2fc62510cabdb4d30676ab4b1ec7de07ec7f58. Chain 2 (Bitcoin): anchored in block 953773 (2026-06-15T10:40:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c9e8f2b4-ca5b-4827-82cf-ac0f7df0f53d.json and https://artists.proofprofile.net/proofs/artist/c9e8f2b4-ca5b-4827-82cf-ac0f7df0f53d.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 0x30fe18e6601a4423d8e7db9dc52885e5041518d0130ba53f9e9cad0a3113a51c. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QM3DF2175209.
What The Birds Were Singing (I Never Knew)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcad174e12d32eb66a17191f34d229a4cea8dbd4ab44662767f73a117f9f65f27. 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/QZTB82579991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81381bb62fc8a731eec9cf90e90a58c26f976c9712e664cc6805e0e902dbd5b1. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/USANG1901584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x006ba41acb1fcc02df74387cff75fafcab0b2d67b26a8f145385d5b190b5b492. 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/USANG1908898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30fe18e6601a4423d8e7db9dc52885e5041518d0130ba53f9e9cad0a3113a51c. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QM3DF2175209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc30289b5feed75952666be14e4ef25316d8caaa8def1fe84f5b2dcf5b2d6a33e. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZK6M2557893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9fa6ff207bc17de642c86d4fd25d18c255f51856d4551d4616a869833b3a959. 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/QZK6M2557894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd428dd03f3ff5bbc12447dae468cda128d72fb29c028996bb5dd57a00b593354. 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/QZZ7R2478294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f365958b0688b64a90f5c2cdc98ba3e1c48d64ad51611e210631c38a5cabf3d. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZK6M2557895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x461d61a9b63bb6911a0d44d6b067bce53addfb615a4d15f861c0a696aed422e2. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/QZZ7R2475803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7cd5540ebea8baeb14d7419fa121882db8e148da9481ffcda5d1d0f4c7206f3. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/QZZ7R2478293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc61c8b7b841a45a11acb66169ebfc5991f2b543ea968ba39294c8cefe7b11489. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/QZK6M2557896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe45ca328d85ef0dd29a4109ab0e6dfc91725fb01f8c98e43edcfb8b085ddde9. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZZ7R2481075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x730b9e645cc5d2c098fb692157c99b25797ab3231178a48e85157b2c1fdda53f. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZK6M2557897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8beef180fc5bd0f08d9c64bc32db049bf8b152c8505226c7cac46956e476f0a3. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/QZK6M2557898.