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 0x7a74d3743656079cc1ef3037b89cfe8b6de69b176e67de23de7e04e78307d6de. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/60254be8-2def-42b7-8f8b-bbb33e9655cc.json and https://artists.proofprofile.net/proofs/artist/60254be8-2def-42b7-8f8b-bbb33e9655cc.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 0x73f4995488b87a7958c91584e84305ea6a96801452bc821bb1772b3171aea980. 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/USA2P1664815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x044d37ffc222e4c68e0462ac715b0eec7c798ae80e08c4f4e85f05eedb4b40b0. 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/USA2P1664816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01f68f9942f4e1007feefbb844cbf25f06083fd34282aaf79df0c66e15cf984d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USA2P1664817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3c9e8321a03ddd735851749df8b0ee77f07dd653fc63d5fdeac50fd2d0a62a1. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/USA2P1664818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9ba8b4703616f744d4ff9e40352787c51368b6da3b84f9db3b81592bb7df04f. 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/USA2P1664819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48cb2b2df998bf205b37f9b6501a1c33fabb36b8608bf3647d65ca84b6880119. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/USA2P1664820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x572f159d35dbb44c6849987e7f245db96d9d581697a50f3aa765dc8677bb9ded. 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/USA2P1664821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ca6b754ac8795ba030ba53d36a38809840c0c27a8afdaa7180f6706c0813f1a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USA2P1664822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b12ed054a173b5c47fb967a8c53da8fb9ff41040b2c96603ddd236866f0dc7. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/USA2P1664823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x792b215caa9878e480d0147a33a738b9dcd0aed9b97348e24299560c3390723b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USA2P1664824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88db4e4e42f555058b71ca5343f254e361030b06197e0e8b186bc976fe9040de. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/USQY51583492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b087774bfc1e2188eeb2c9ab438d757cd4ebc31264e36f9c102886f3684d542. 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/USQY51583493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd86f41af3cf91ffeec2b5b19dce67f21dd7e31db9596ffe87a50a281423d7db1. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/USQY51583494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65c60204372e2caf9d2f1b87ebd720063e6fb749fed2006ce938267984d78b52. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/USQY51583495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8d7466333f11c6f77bebf01176d0fc149bb76e605bbca728bb6abf8d6929ee1. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/USQY51583497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4760c17b653a038189c7987dcdde4b35a17f38aad0f67d0bd56a3e744cdbe46. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCABZ1426478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69f46fce173c3bbf70d273fc9d399135bf5f076199c3724c2b45f4c8e73a4efe. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCABZ1426479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcb5b103196c6d319fde863ed7c19b09d0dad556ec81893fca0213615eddd2c2. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCABZ1426481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00959e34ceedf81019921d06279891ab5a5d597261f58dea692c8dda8a8286f2. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCABZ1426482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x491feb87198be1924bd1f487109bc23e1d5a06c5b2ccbed1d8e02c02b43d51f3. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCABZ1426483.