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 0xc6fd9f5e17dfd4a3c37d73add7072cc46f68e7f49caaa34c452d4098e54613fa. Chain 2 (Bitcoin): anchored in block 953932 (2026-06-16T11:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1f5a9991-6a0e-4eba-8ae8-319ae407cafe.json and https://artists.proofprofile.net/proofs/artist/1f5a9991-6a0e-4eba-8ae8-319ae407cafe.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 0x250978e669c01d636771f7ba920515a6c059f746072b8338ff515cbd7402598c. 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/SEAEB2164010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63776926064602c791e42d6f4cd7c593eccd536dbc4b4eb3f25e0d0bf90d6b75. 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/SEAEB2164030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08ea68ad25b39e2220bd5fd0af27c06577d429f2bfd43cb868a5f284fcc0d0ef. 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/SEAEB2164050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cd589bb1006124c57abac4d8f00f1cd6ad6a0f31d8e4c5a4e8014d1d11f765a. 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/SEAEB2164060.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81ee8841bbfae60a7735a090bf98e329568d3b5ff3509ba52a2106b88b9237ba. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/SEAEB2164070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd9802576ceaf8ac57c5c0a3fad27a0e31eef76be43013361a84a694cf019c7e. 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/SEAEB2164080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41ece698148a33e0d0e0517d670dbc35de0be0a769167f00445647b54ab087a3. 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/SEAEB2164110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dae283e06d4eec307eece30c3d2add633644bbf0ad24f142131a9a57505d6be. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/SEAEB2164120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45df3ad7cd18431bf4a7c712bc85549b3d396a68e9a691e9a569253a759bd4fc. 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/SEAEB2164130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x274758787493903e9c0742bea1ed59b90644213a6a27938c2a6d0d3d02e4627a. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/SEAEB2164140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f7234947bff990504d5a0f4174de6f88c407cae25a7b4d8f8294f81a5b4983e. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/SEAEB2164150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0481825d66623e7c80d736c95ec8b0f8e21759b5c89d4e4be681da858e150696. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/SEAEB2164160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40bc91accf8d4ff45f5a97b5115276cd408a1aec89bde62aa4ed241f5c9529e1. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/SEAEB2164170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08adf66090c986fa6c5a906d86ff5ed65a644330e848351aa1930f0770bdcafc. 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/SEAEB2164200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c10e54346eab362e0d239d3bf63f998b28aa056902ee333bf77100c1d02d963. 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/SEAEB2164210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x221266ae7487c84977aae8547f94364d6c1044bd0186930455af7293f27403a3. 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/SEAEB2164220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f1f898c2de124ce0454d617ae9f1332acca7c8d4f37383f19b48484ccb9ca80. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/SEAEB2164240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x539baa1661698fb3913342bb1bf26602d921038dc686e8020c63d379b57d9389. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/SEAEB2164250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0caaed3fe1fb091c8353ea05e25e8b802aa70b9946f00b43f5e1179810b287a7. 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/SEAEB2164260.