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 0xfdeb1591496a100e91d85c5050f0184e521a43b08b832a314af0270d6831f515. 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/911a9091-56c3-4bd9-9b9e-7c4138323797.json and https://artists.proofprofile.net/proofs/artist/911a9091-56c3-4bd9-9b9e-7c4138323797.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 0x4862be6b6de4b62f18083bd365c5c0b6a41c1cc212592b7b803cfa092d1eafcb. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/USHM21656281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf430504a5d344d3c9410a072ba807ed50a13c7e7eb7217a3a60ebf01a3c3ed4a. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/USHM21656282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1ba9fef71b215095c408afbedab8578fb4a17b3da17c96793081af1fc3a0d33. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/USCGJ1747505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6830daf510082d2a2ff654f07511a5f5769878f5119fa1ab434a8f7741671a5. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USCGJ1747506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3d4bba54c9f13b67a7c95529b4350386c2f5903f637df438f940ddadb8cf924. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USCGJ1747507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe64b8d0614b125467a75945f8bee438270d92e34624d73f807989f44e3e27f06. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/USCGJ1747508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe44f82a235da79635354e7a59397f63bc3ba7779d5f33e6b2e5e5a48e1334415. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/USCGJ1747509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf0bae04dbb78d5fbb650867c56c2ad992100728177d136ce6a17143ae65e838. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/USCGJ1747510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90bf9c11a0ce2aa141d5bda56e98186e28ae386ff6c69ab0a2dc30b8e3833b41. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/USHM91894485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x249617539982c0663a5894a36b0de23b455db45e2830dfca8fff58e8a719a08b. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USL4Q1886943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x406a632f2a803446d8fb20e8be7b20d20cbe52afd8a0682087b5f14453258d6b. 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/USDY41933146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04be10ffe078d5a2a87d14b637e4061fea7eddfb4710566a1531b645dab5e27c. 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/USHM92063840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb957cc9a5e877939d10119f3eacd553cd7f9bf9faf8c096db1b8ce4bb38192a1. 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/USL4Q2025212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x203e0d2acb8a813e5ae44856ab6b95e00c78f37ca2ebec65b7f72144a43de75d. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/USL4Q2080722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a156194b27df73775b11a1ac6a75b59ba4bf624201e6070f8f833ac5a1d1e59. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/USHM22114088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a156194b27df73775b11a1ac6a75b59ba4bf624201e6070f8f833ac5a1d1e59. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/USHM22114088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55336a5228561da0b19305e2bced08ec80135cafa991d57da8691df3cbf414d5. 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/USHM22135658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc203de67f29f8d020a8a3a8f7e6542d4d134356a4b42b6ebbd54a7912d08466a. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/USHM92181253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc451f569f34dfad96dea360271c044c8f54773a3224cd204f8e20d135ae799d7. 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/USL4Q2109002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc750bd040299c5d5da55f785862c416a0f61cf36426867ae350c5b3984dcc3ef. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/USCGJ2235681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc750bd040299c5d5da55f785862c416a0f61cf36426867ae350c5b3984dcc3ef. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/USCGJ2235681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1664e89a10a0eac8a27ace1252ed027e36209287d74173150ea77a7b056a5156. Chain 2 (Bitcoin): anchored in block 958493 (2026-07-18T04:34:53Z), 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/USCGJ2235683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4676b804f4f8387a3ed6cb8ef45cbc62df51d12ddd04cb310c7c788aeca2c912. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/USCGJ2235685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f858048b01f48ce5f7047bc87b2f31ddf543aa08a06eda212aa8b1a67c1607f. 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/USCGJ2235686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36aa436da512ba7161db091a174e5f30a407944d376163909a13a647b42fc36f. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USHM92210502.