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 0xdb09ef0938bbc5128b14a5d11900040ae4fd8e7f8eb210d92946cef2ec1e44d3. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/710da02f-7d73-4240-9945-3d43bb1aefcd.json and https://artists.proofprofile.net/proofs/artist/710da02f-7d73-4240-9945-3d43bb1aefcd.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 0xf8a15f6efd43e058b7d39099c01483d1c604a6086cdaf23e90e51bcacc41c643. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZES72285149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a5d765136296c9677b8babda5e1f388874015730e27a636e0a4b0e2842d9887. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/QZNWZ2304470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6d2806d4af11f0925c9f07e848151801dcbdc2c382b544761bd6d5b2c86d8ee. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZMEP2544624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabe28b49b800d0ec68f50fc3af6ecfdc929f43170ad741398436cefb4dec1655. 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/QZMEP2538608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b530c003460b34b0df89c502bbbe5874dedc67fcd6228aedaaa7abac30ba6a3. 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/QZMEP2542278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17ffbaf4e5121ae3f4afb155b401e39894f60786e02149ca872c569051bb5c1d. 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/QZMEP2568621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0215f287954322ee3f221b3315df107ba58735debfed85c5993158e2a400ca40. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZMEP2587499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea49edb9dec8990847c2ce283942c1ba709acc7700ab111b6aefd1b7ec685844. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/QZMEP2574737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x236377d0c8da7efa73c0928477fbecabf94b87317bfd35eacb2ccd2f2e394259. 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/QZNWQ2543165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a71dc0ecf6e8f7389dc9441f8a59cbc60385d8fb1781213e62eb86a23f5f563. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZNWQ2543039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5fecf11960023a18c12b24c1c4cc18826bf888ffed0a6dadf88ebd3f76256e9. 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/QZNWW2533920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b68f45073de509f3922aac67cfb598714e66011648b9638e11118bea3f39393. 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/QZTB32522257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d77557615164bbc03bc99a5d1ee55efc3f1a24f266f7da36b4564ab0c258626. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZTB52536386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee4d2d8613bcc3c09ae791e0c750e38f6bf14781818fe136aa2ae9958beb8b17. 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/QZTB62516869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b08b50e4159b168d576c019b0ef1ff2f931dc151454d74c2951c155fa921db3. 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/QZTB92569188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xead0e9499a891b2349b9028945aa3fc2efed54202648da48e616ed563ed45950. 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/QZTB92592281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74bff5185f32699818fe32d35748008f9ec1ad4b5c3288bfe0f46ef5a35fc097. 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/QZTBC2501884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0f77532d28e477a75f0eb0279033287425fede14e90bfb453a9fc47c1dad43d. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZTBA2538383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53798db9e29a040e12a83cc339928cf9677c928b46398378a5448295a4d294ba. 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/QZWFJ2551669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0866ba2650ba1d74a91ab10507f99392362fd068fe1e7cb0349822801b91d7dd. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/QZWFJ2551625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c5ac6d7e7d7ab4194b86fde3940831de9b1ccfda33d7170c453c2b436bdc98a. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZWFJ2549026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a73bd8bdcd5339451675644f58284679bdbed728d3b7fa7bca508d60de704d8. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/QZWFJ2548979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13ac34e93caf7154de0e8eda0f7983486381d1111927ba3c2c5f2497caac7163. 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/QZWFJ2551651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53f3b5f438797ae587305c287c5c5ccd3dd3367297258286e6b34977ca9ce5d9. 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/QZWFJ2551676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb3ce32514163376fd44693cd2fdc5964f9add7095805a6bfde0a3002a2df29e. 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/QZWFJ2551632.