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 0x0e08ddec3269a45aa7608cbfc036e5d2d529898cba133d532c15bb7f1d649f25. 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/5d582445-aa2e-4755-85a2-4bdf07a2a55e.json and https://artists.proofprofile.net/proofs/artist/5d582445-aa2e-4755-85a2-4bdf07a2a55e.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 0x6a64350b66b6ae7d2e1e2ca65bd49ca0e62b7885f4eacd7aaaa2af776c98713a. 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/QZGWW2018639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09fb47838a7d70af99afe4e4c63a060e6718b5423208e61ee5d58380ee6003c2. 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/QZGWW2018641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fb635af1e2af65597975a27e445807713eef85244c1019528958fa7b38af769. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZGWW2018642.
Prince Igor, Act 2: Polovtsian Dance No. 2 (Anniversary Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4a0b89da44e3465741600702cc1f44b3b61b404c90f3ee08513a90c3a8d695f. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/USDY41899975.
Sonata No. 11 in a Major, K. 331: III. Rondo Alla Turca
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c4e554427887b41beb4911dd7b19874c41f718ea018e1ff926aa2c7227d6323. 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/USDY41899976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2952992b2d0010fd374b062fe8f4c734b1bbcc74de9fe901e65c7108738d4f42. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USDY41899979.
8 Humoresques, Op. 101: No. 7 in G-Flat Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea8a825ad55d0061580a267cf5d4f1f3b37b33b9450e51bcbda0b9f4d2d6de86. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USDY41899982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48e22a9fb5058d62c0aeb3a5f27b063b4d6618d4ce2b33869809286216a37ab4. 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/USDY41899983.
Orpheus in the Underworld, Act 2: Galop Infernal / O Sole Mio / Turandot, Act 3: Nessun Dorma (Medley)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba26633724b0ad9b793fd7bfd9c30584867db7b8a7a8942486d9d75dabfd8c0e. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/USDY41899987.
I Could Have Danced All Night (From "My Fair Lady")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeba264cbd3c6b571610c36a7aaa601ea37948066dd0e083d933edbfc381587ba. 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/USDY41899990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea33ee14e410d92b1e11a15c9f751a53056a0e3254fef473dc4da907455d19c0. 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/USDY41899995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8866dff9bd8bd394ee9c7b123c1e909b494a7d61d8014cae61bab1f2de10a298. 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/QZFYY2022962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf3d8c9c36decc1c90eec4cbfee3fa0900ee08595429f8fed6c52bd93016da83. 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/QZFYY2022963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3adb6514905a15b059aeef1a379ce8428379cdf6e44b87523995a8cd1e0c2a6. 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/QZFYY2022964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x518b450935a44cbceb5db4a8f23f1147f29da641199ab025d1d8e2b50e8cd915. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZFYY2022965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x157016b82bf0a33700e984ecaa9f2ff19f8e1b6fd31b40e02b36a7f8e6dc25e7. 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/QZFYY2022966.