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 0x12231d5aab8eaebf357ae544f5dd3691645636f3c4a9b775e15c123a985c1c63. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/256de176-d034-4a94-bc7d-5e669dd6b603.json and https://artists.proofprofile.net/proofs/artist/256de176-d034-4a94-bc7d-5e669dd6b603.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 0xafd59ff3dfd9ba45c609535d11f4073537cfb35a91ebd5442b5654c3021cf208. 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/USL4Q1938257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec7fc93902de1cb4bf6cdf81688082796b77e3aed4cd8f1d460c40c327ce8376. 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/USL4Q1938258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fe20df357b0af8b42de2ae60215537fe06fb9704104e1ad6424f7380ce638e6. 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/USL4Q1938259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd936e23aae52f0a355e2d8f30d5706830942ab53831f0282c83072583a266008. 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/USL4Q1938260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe0b36eeb1945b18e10ccc94f1bcd0ec3726e26f3d11ca57730bd9517aaee095. 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/USL4Q1938261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x465666cac2e8a9ef4a7c802075231ef5f350eac7879adc8f7a70d41b7dffa1d4. 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/USL4Q1938262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe975c62de5c66f158ec3c13e27c3130671d377d17941605f98e94f231c105ed1. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USL4Q1938263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf385eb68cbe0983e364cfa5c907f332d1b219d4dc28fe07e16c3a4cacb0d67f2. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/USL4Q1938264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15ca31051f6da77d4d222602d7f99ef12dac1d438d8926251ab77220913705aa. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USL4Q1938265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1127650c5ac309e68c6b2addf7d09d087f3c6c5018329c51272fc13ff3f34a9a. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/USL4Q1938266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeee6a435f111566c459b5b7b340ac3073864c21ee1154db76d52c912300411e2. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/USL4Q1938267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd8e0a78f82d70780c4406418b34bb5ac38375f95f723dcf094e043519336256. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/USL4Q1938268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85192018099a67e0792b359d11c1c2599d7d635cbc560b78563a1b5f5006f245. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/USL4Q1938269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x389d37df29711e249fe827895021ab774f50c1e7a695d0365c1f24f4cb0c2ad6. 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/USL4Q1938270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a3f1dd9a294f8cb5959c5d28761eeed63d89db99d8704258eb1095c91cbb8a7. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/USL4Q1938271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a43c19e503ab7e84807c0889a8967d189391b0f1043ff09d7514750342e1fae. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USL4Q1938272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x372732799fd8468f3e14a0413e060bbeba5630e48033bf5443bec0ef88c5e380. 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/USL4Q1938273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbc1672ee9f32adb80e5ae1ee601b739c929f52bc9ce44c46650c000e9ac0c8b. 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/USL4Q1938274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77b5220379c62032bd95241f24fe454fcf6f0f5e5cff5707b09d8f68d8ef9001. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/USL4Q1938275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d7b0d4dba72011074477a080d32f42c30f4d4c409e0f6facbd91e315864693a. 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/USL4Q1938276.