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 0x1b2d615ca16592c970e0ce00ae30f482c372d8ca2a4a835b4bd0af4b35e2ae9d. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4619ca2d-b6ee-4e2a-b283-f65c20dbf606.json and https://artists.proofprofile.net/proofs/artist/4619ca2d-b6ee-4e2a-b283-f65c20dbf606.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 0xef61221d8a96b43fab28223b503928af05e0244e92911b6dd21775de9e9e5620. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/SE6QE2318730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8048a5b6d22394ed862ea35ce8aa383da7192840d906f9a58aad16203f1ab15e. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/SE6XW2387515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3afb62689e98ec775292d33a2d61501a140fc90c962a765b6db41cd2213e1b2. 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/GBRKQ2454854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1aac0f7f30972972424eb2ff99c43d9248dbab5aeb57cda0aed5e215e6c216a. 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/GBRKQ2454861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8827d519122bda5742853b320f01f4563fac0131649a34da4990ad0c5cbbd5a7. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZHN32400603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x467e39be18be0e14f551e346b440b7e5b3257a69ea38138e6a32eddd2ef0bfa4. 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/QZRP52390747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcbb022021d012516c6bff4d920b34bfc5632b83f1f75c59e805c691184d7040. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZRP52390749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ccd9e26e037a5691f30c0a08039f88324c2b72c2cfe14540fe986a9329f6b05. 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/QZNWS2252266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f2d37c4776966c21813c5290a729c9f283e1bb163ce5ec3cf1d7481331b54a4. 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/QZMEN2254978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbed2bca81c32c2ce3c1bd4b53057ff304ed6ae3613dc20d42814897ff133b504. 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/QZHN32141135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5086cb817627ef19c27499498c16ace5258220429a63e369809be526e3fb8b74. 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/QZHN32141136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc58be466353f54d04d4e3feed4e7344c679c08ab66477f7647dd8812fb566928. 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/QZWDE2433140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fc9bca05ccf3b30cc093e0e892f79fdb91af9ab46d2ea2c1e5342a9f0299ecd. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/QZWDE2433143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5a108e8e80f5b72bca3f1bd88b255ba48a7112723602c99d2be9cb8b31c9856. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/QZWDE2433144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8827d519122bda5742853b320f01f4563fac0131649a34da4990ad0c5cbbd5a7. 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/QZHN32400603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x615ead04a7e26d44b5c88ff89f472ad42294af3130d9c3b0b8f80af739bc7162. 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/QZWDE2433148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed12497fa2b50fef0980924ab9c68c5f85cd5aca9316d31f60701a91631df49b. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZWDE2433151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7f439334b2a9ec87f7faf90bbf202dd14b914db8e801c81846d62dc0b9c88f2. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZWDE2433152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x084af179cdb8f917f8e7c69f6f6c57edb7d695ed06e15bf3b5c5df11cf83ed24. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZWDE2433153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ffaf4152716f1e899102692fd464502d553a74397c1aaaff39244f50c2c9302. 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/QZWDE2433154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b5274aaf2c57f77462e419401a378e1b09288922950e553d6c170af3282b3b1. 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/QZWDE2433156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22c98d0d3745a0e8f9bf9ed7b2a7f0b99469782ed4486241664d28c7289ec14f. 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/QZES52315024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e618eae487d6228e484576a4febbf31ee507ad113f6b54c9f1f65e5b1046bb9. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZES52315025.