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 0x3d555ace7158ed3acb0f9c15f96c5694cd59ec93c043e669db568ad46d6a5d1a. 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/94972bff-3313-4fb0-ae1e-d910979301c2.json and https://artists.proofprofile.net/proofs/artist/94972bff-3313-4fb0-ae1e-d910979301c2.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 0x66968d30147ebb121f12dd79687f65728dccbf25574b4f0741052239f0dcb538. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/TCADY1834141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d9d559c67d6b39e7c00a41b95a727797cb650cfd9ca19a221d5747bcc642d68. 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/TCAEC1943366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13b548e39b258a312e5f235e8feed2809b3293a612f1dbbc7de395be3f1bcae3. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/TCAER2067631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x651f34930bcfa1ccd957684724516876d67867e4bcc826fbf3d9f9c8abbdc48a. 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/ITDF62019219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa43ee27493ad3c6797937c2199b551437784fa03402b2103e4b93320ef14b26e. 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/ITDF62019245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x692f5b391dea2759d6b3500eaf984d983ec1e9b75f71ecca77883ffa3079ee77. 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/ITDF62019340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c66874ba8f33c3ebb82dec332aeb56466e5b0742d967f7df4ef8cadc9d77ffd. 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/ITDF62019319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a14f73b4616a30f43ed7e1cef4681236b9532be4320d6ec9ac4bedda8beea48. 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/ITDF62019339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a54b7785019a3defa07a37a72dbb9cd9af77227a0514e93baf03670cbbe964d. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/ITDF62019343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3149912180c8c009002345da3388399dec077f6afae1c16b48a54eee2e8285d. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T11:19:23Z), 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/ITDF62019344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e9b0a48c522f34e63599aee512a6e4bc4cd0dd691c198ad8ae2794ed3bc2c87. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/ITDF62019342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f467662e2ca205d8fb831380e40cce7c27d8daf335c09b5e2bbb826fc20a254. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/ITDF62019336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x651f34930bcfa1ccd957684724516876d67867e4bcc826fbf3d9f9c8abbdc48a. 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/ITDF62019219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe182e2f10f0166f6c5314c2feab243bbd801c67801e7752d5d0529e4cf3c6c5. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/IT6KZ2200041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43c02542484cb16ec7c21d393e9bb54a00ac9188b9ec555f7e98116aa02ea8e2. 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/QZK6J2346962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90f77f06427c4afe9f211fc3f78eb5834d726d5729f7f6f460944223a3d4a85f. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZTB42323111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36a1bf21a374253e5286a2052350c7fa7732dfec47fe800b95ba20c7cd266c1e. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZHNC2468559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed16087e49efa236927b888d8930b58318e4c3f99b38d43ac260381bf585edba. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZNWQ2411505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde17d0b74b643a62ca7b10c3eb8fb039a941573fbc9b65dd02c54165ec54bcdb. 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/ES5022301107.