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 0x80a232481343e71f91913ea06b402432a90e3ddecacfda5696eca401ee8db3fd. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4b074fd4-4984-4009-afd9-a5fbeb3512a1.json and https://artists.proofprofile.net/proofs/artist/4b074fd4-4984-4009-afd9-a5fbeb3512a1.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 0x54b27c3b44dd9307e138b3fd726d033d1824edd202dbbd728da7f3fb12b9fd66. 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/LVL152302521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7ce4d0642ffa847c20da944e625e0fb2a2f0453c5fa4b61c071ace5523dab29. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/LVL152302520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85a8f31d76102e5b80bd7668ad5c250cee5334e5eb81320a37185014a09ad01d. 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/LVL152302519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0409313755590bb18f57b227b1c84d95bb62f4a0bfaa3244293e19cd322fbe8f. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/LVL152302518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7340757ec832fd972a66e3ec0ad86c67343b5b3df4b96a23bfcc34c1be524d82. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/LVL152302517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c536b778b3aeb40d05cf0c85d002aff0f50bfff5ecd600774dc8a8006a0a3a2. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/LVL152302516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1adaceeaa8882964ec7887924c6a4b8c3bbf3810a63520ecbd3fee567c44168c. 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/LVL152302515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f7eb0b1efb2b804bef0eef92bd5b5cd95244689ffde05156a30afdcaab0e72c. 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/LVL152302514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd7f04d09695842d28839a6dc71f08ac37ae28cca8d0cd5d310e88689f67e131. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/LVL152302512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec1d73b154055a26d485d28e7cde82f52360ba682329f1b007a186c21b589db5. 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/LVL152302511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cd05e097b62394f021fc4a292bcf1008e0c2f94b628ebc37752808c692d8211. 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/LVL152302510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd72b4d7788e43edb120da494d504a64b36b0691919c2f591cad41aff78bdacb. 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/LVL152302509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x044541ab261f2c54af36770f86643f9ca47ad90bb47fd68a988e41d747e0c922. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/LVL152101722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a8c974fceca3b97644efebf0e04e7616f73461ed1b943e15f8fd6d367a002f2. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/LVL152105245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf814153452410e78b3a17b567576000a96b63a3a3d92f427a9c41facc9a2cb9. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/LVL152105296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3423ed515fd14b6579ecc7666872b6392fe23423788d4dcd254800a18c7a79dd. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/LVL152200100.