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 0xe6466a2a0ea28fdf85981df725b7c7078db55de1ead8b36401e3f7ea8f49a94a. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8ae2f647-2dd7-41f6-8075-17ad49840992.json and https://artists.proofprofile.net/proofs/artist/8ae2f647-2dd7-41f6-8075-17ad49840992.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 0x56a8a66aeeb7616eec43cdcf13166cb32d9d699b87a600ccc3d5685a3aa06ffe. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZK6G2435676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c9f7fb099df76fa82bda5173f3484187ed8da20dab776ed43ce968b89918e51. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZK6G2435673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x475b3aa48a02d4c4ba35afbb96acef19e79bbb6b056d0e399c4e35d0098ea4bd. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZNWY2554524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9db29fd0984e2f406047b9cd67ab029da1c3bd49431998fe2a9860b4f7c8e48f. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZZ782505653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ccf019125f4abd4ccc8eb6b30154cbc64148c20590c4c7f78113563ee3a119a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZNWQ2483032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4450f14b8bf3ca0c0afb44b59bd13d8d0cc78f6b3e22a78d94a6f15d20bfb71b. 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/QZNWX2497289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49f4e5686c51005dd09ae2b2b7d5f4a0999f487a10f63637bc61b3ff9d5d4b26. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZNWY2407953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49f4e5686c51005dd09ae2b2b7d5f4a0999f487a10f63637bc61b3ff9d5d4b26. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/QZNWY2407953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc85b56b541be19fa3d8d9c680dc4906066ab8b0657400951be63ecd15cb47319. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/QZRP42424929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c5dc7bd04ad9d12f7ccd6b29556e9a78c9e88bf7da4e7b41dbb637f341c80f6. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZTB62499305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb385bcf1f483d171cc310eb9605a9ff5647ae3cfef0f98b100400e265196499a. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZPLR2583391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceaebbb89ac3c5b0dda4c0dd3731fae39bc203c3e02fca61f541d1b10d4013ea. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZHN32504504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72cf77d9d306c54b13e9d3cf31c83e16cd996ff0c33e0c82af9d89c3dc51eacf. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZK6K2542561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x424be5f07e2dcb32355d48e8dd27c1273260dbe6395bb7202440bc635824672b. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZTB72590548.