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 0xb9e021f0bef3f1a298d259237a795a48b12891fd7a7ce254c9674dfc722fea6b. 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/91a268f9-504f-4045-8f24-27e397349eb0.json and https://artists.proofprofile.net/proofs/artist/91a268f9-504f-4045-8f24-27e397349eb0.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 0xa0931b9bc72b5ca19ba6cb69a5f24e1b83b77340a2fca43406121bbdc1791fdd. 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/ITM3U2200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c15510a08843e0fa40a3f47789235e455d8bf3f41bbeaf61fa043e2334ca511. 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/ITM3U2200029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a6eb2bd59d9958ca7ca27f7156ecfbad51956a0fd5f7c8547101c7be09a8faa. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/ITM3U2200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9abd43146e2e54299c6f23ed28c84edb0bb1fbd06a295cc7e525f92e2b0ca6f4. 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/ITM3U2200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0931b9bc72b5ca19ba6cb69a5f24e1b83b77340a2fca43406121bbdc1791fdd. 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/ITM3U2200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9e25f74c430517761afc9ad2b62b0a05dc037989b52afd94a8476f48acb1744. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/ITM3U2200011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91e4c1c7928c06c5916cf94e512f6e3726d2cb1c3779961fdc7a37254a95cff1. 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/ITM3U2200012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56346afe9a901142884483eca4c2b14896422b18d36361b81c89a42817db5288. 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/ITM3U2200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc6ae09406d1948d1c06c57aa2fcdfaae2a55af8f6b447b1a733456ebf2c4084. 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/ITM3U2200014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc2623cf3bac64c13cbf8992095254df606e2f5ae0b930303fe82f859e3b9c3c. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/ITM3U2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x518c434cd92056c1ce3d7630e0bf34a8a749f31cc81a3d778e5ff60a2e74d3e7. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/ITM3U2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b8074d396a1954fc6dd190e9a6c5d5de2eb807126d42c9a3db4623aa0783867. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/ITM3U2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x564edfe397a993a606ab7af2d9773d59fbaaecd188259467db5b0c88c40c9413. 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/ITM3U2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c788fa62a4ffccf680683467a07428c5573b1bd4bb7827c02dfe1cc735f54c6. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/ITM3U2300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x280e4c903013b15cdde21503e9baffa281e98515c459b3f4b7f5ba6637afe758. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/ITM3U2300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebd4e8f37ed3c5aadc8b8c95723a5779d640e238058cda2e4a9b75502e9e8448. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/ITM3U2300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1be7fa9810fd04a35aa452d5f61d8165fe594ade12a4d4e0685c8586c0772681. 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/ITM3U2300016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb84db9e37220e8ebb38b48b61869412335f18cc4c5c8d4a3c64355c4d3f29961. 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/QZTB32245893.