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 0x6fb74fca65fd405c992b9a1080bf89040c25514eff8576ee03701c88aed00fd3. 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/d816da87-b974-43ed-9eee-d4efe3a0f89f.json and https://artists.proofprofile.net/proofs/artist/d816da87-b974-43ed-9eee-d4efe3a0f89f.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 0x7554ed2cb6b188f3e838e50dc0d29396974ed60245261190f33963c624f17ff9. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/DED839840903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ba095f512a0cd1bf1961661b3dfe2ba4cdeef11932958aa41c8dc1491670a5d. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/DED839840907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5990e31cf0227557e888155f793cb2959f93d6482ce146b62496e9eac8f1a6d0. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/DED830053102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48f002147bf683770020fd6135fd9c45322ef46a0b1a660d52bcbbb78e4de65d. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/DED830053104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c4066601ce654c0f15a51c30b50880a26ec86d0e902e3f40ed997c90cb6786c. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/DED830101302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c24c2de0893125a8d9ba3428fedcaf0cbec40eedbde3496e791d014a3611978. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/DED830101304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6635ef4baeb62c260448ef50472a0c01cbdb99a82ea90174cf1218efd28fc0. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/DED830101305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2367a9857e1c9b863058674f24c2e462f9e515342744af20b89ba8fd56b12d2. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/DED830101308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x345455d8989c690ee7f0c0600c389fdea5ad22b49140eff9b57cef9dccd537a4. 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/DED830471804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc39330c3cc9d5dd2830440a2095283be4ee7a308f4b0963141a3184640529ae5. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/DED830471806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0d2c9fc886f2cf0b0a13e55b6aa3df4b735b52ff4ac6a5d8c0bb769a526799b. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/DED830471808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9b58643254fdc091e446cfa03df5e6f76545e65933fbe65252ac50c51ccef6a. Chain 2 (Bitcoin): anchored in block 958635 (2026-07-19T00:58:42Z), 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/DER370963001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea05c05960c74b9a519736116936378068a328ad17ca685e15c3692f7d315c64. 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/DER370963004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x477128b64dd82c5706d0b1e0205df32140aa0633d2af2016fc033d408921c31d. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/DER370963010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab48a81e2e4a971add273c560f5e66a98551316a6faebc6347f5821598d3f2b7. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/DER371383306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4fb597ec9ee39203acdcb8b5d5daa3aef79b1b3d74870d77075b49780a50341. 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/DER371383307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c6fb0d041d1e94182f55e27c5c64e48aa8932a6cd8a35a43eea7bad4d74dc6a. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/DER371383308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f8ef313626b8e9b6471ce9e432cb96daf80e714a7988ad6cef4580114dd55f6. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ATN262202101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb51c52091f4899823a799936a4e02eeae4543f0c966e3c6c251a72f64c8f6db7. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/ATN262202102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x631c143140da2cd0516d11df00efa62313a660e3d7049de90886ddbf9adb25ba. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/ATN262202103.