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 0xb35a8e6ad974a0baf4beb2d6f08d152366be7ddd1d929315f1c35a16b1a86308. 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/feb5d6c7-c540-4d2e-afe6-cea7016f9951.json and https://artists.proofprofile.net/proofs/artist/feb5d6c7-c540-4d2e-afe6-cea7016f9951.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 0xf92fa19fd9833823fcc5976153b134d58e8849d5dafea8a4174e9c1eb052fcd7. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZWFN2340187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x345875a96287ad37d6105c5d36c3a6f59be9cb478b0b3f18873579c3cf832303. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZWFN2340188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3706dce392502d576eca67f5a067219bb7a55c7b8fc2e0d14d214cd4ce01acc3. 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/QZWFN2340189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e96d6c90f50789c58f85aa1e8f5149e3448773e486975fac80637451f684b39. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZWFN2340190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9af67128f849d9dba39db69081cf8779b7f4e89004743c74af17c167723fb88b. 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/QZWFN2340191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f47454a68503e6930ea964bc39961c3b19949f743a27ac90c477c465db6d07f. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZWFN2340192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb94bcbb5940cac388da5e2834877a3f089c184186956a4951c66890b014462cc. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZWFN2340193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe44ae88f8f53a11a706bc146849fa8bb370fa03d55259b36b11d2f2632504b6a. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZWFN2340194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x165c9e2d9743103d8bb4687fc8b314a697b7a7e1f3f0c53c720df24e4027fe58. Chain 2 (Bitcoin): anchored in block 956404 (2026-07-02T22:12:38Z), 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/QZWFN2340195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf4b3b67ae6409d90c83561b5ec4ab08c8633c80eb42649035f9baa855aa26fd. 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/QZWFN2340196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe39acd937687ee5d6fe1a88d0b6e17ae9f88a42916170ce217ec86069313e8a5. 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/QZWFN2340197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef6492c34f27949f4d3ecb9d6507962f44ee79b694db574d7bb7cc622f344ceb. 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/QZWFN2340198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb06efbfeb314ba610a1d71d321f494b507c117c78c1f1f7f39a17e8911246a7. 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/QZWFN2340199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0500fb5387f52b9f08847b6ad4ca14a570ed61d26c640780a43a20a01e1b047. Chain 2 (Bitcoin): anchored in block 956404 (2026-07-02T22:12:38Z), 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/QZWFN2340200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x377fdceae3e6e9ea2977e258fddacd12f440eed78de21d0996b9d3757015f618. Chain 2 (Bitcoin): anchored in block 956404 (2026-07-02T22:12:38Z), 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/QZWFN2340201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7a867812ef22b2c2fc4aabd25b3594470ce5e4676cfc642d3093ecc496eb23c. 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/QZWFN2340202.