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 0x05a0c18c19876695a047b49bb7859f2eae7c897f1de8b3705ed9df9a12aa9221. Chain 2 (Bitcoin): anchored in block 953602 (2026-06-14T06:58:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0f25a9be-dc9b-4cd2-a830-22a0c561ab4e.json and https://artists.proofprofile.net/proofs/artist/0f25a9be-dc9b-4cd2-a830-22a0c561ab4e.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 0xfe6629e1ff2b4e43f0ef31dfd9f682fc1ead6cddbc73f32e9fe12a37cbcfd89e. 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/CHB242313655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34b4a55e681f195a24474ae3e21b23ffee9ce30e8b31216a379ca9ef8618aa30. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/CHB242313656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x614c1e7469d4709b1be3c98597e8cd2262fb87d426d3463ee312d18b318d7f9f. 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/CHB242313658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd91db411287e4077a0deb063725521f39cb0ec9dabca061db36fb1204485e3f. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CHB242313659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7072d071ee40ad9b08a68906de6371384daa16f57bb990022769ce27aee3e24. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/CHB242313660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b1911c20825c773b789849fa306891ba31f9d03d9a3bee27d13ba2ff10da09c. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/CHB242313661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc439c5867ac832c34a9381bef4fa4ea9ce1422a802bdbb71ffeaf88b4d7b2f12. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/CHB242313662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3253ccbd9656a3338d99fa1c93b9b387b5950b7ab9dde3c0e47f9d2325fe81c. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/CHB242313663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd90e2e83f02a1d6e48061b8e774c6d10227555387916e1b130a7b9faa912ca. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/CHB242313664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43e75b32e521ae15bddba7c911ff50e12abddb6169b655a9c248a6d64bab63fb. 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/CHB242313665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5edd181311b6da89dc8a514f82f6760281eb0a59401b1750ebe15984c225075a. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/CHB242313666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53ade6cc127aa9f753f17f2ab9842f338e81d99ad8a7316ae9c3f7e16b7dafba. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/CHB242313667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5328a399ba0b0a7b4be636b970765e069183476dc86413f6adf24a865edd156. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/CHB242313668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f7b5fd5041d3a2e29cdc8df12d9b623c5a4ce97da7f027af2ab7440d41261c1. 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/CHB242313669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde7b524f15dc3129f609ecf245b70e6104fafd8f1e466714cc609ec9a896c385. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/CHB242313670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf54901fb21d01ddc71ae15d3811c2631eb5ade1aa404a54b49c74076f2e1cfc1. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/CHB242313671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf46866ce59236f306dd6deab71c79da891e68d1a83cb9b12bc479e737f235ac. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/CHB242313672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80dff4c1716321f437fee64fb1eeb5a4667a614c64bd418356a6798c2da76705. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/CHB242313673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee41dfe5c5939c835b4ae0b49c2a9f7ad4137b53444548437edfac03a349067c. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/CHB242313674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa718bae666de1a3ff4667d65ebc62bb5e245015ec30b9f05682a1b6401aa279. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/CHB242313675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe97d2dc2a31ebf209d30250cbf961a956fadfd2ccd45738f2693a0dd79e6dcb0. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/CHB242313676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe658864a2e1807965179172445bdffda3c854c13a9b9e2d7f5272341cd374663. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/CHB242313678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f4c81bb516db4b9c4e883c556649300880298b624150e9d9ff47524fcad7d46. 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/CHB242313679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4485182b978690a31c2c7bbde8c4915c89270e520e68e61766ecef89b055c07c. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/CHB242313680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x469f1d6e1c94d6eaac133454066fb8fc7efd094fc927e4f134f0ba0ac9c86c04. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T07:21:40Z), 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/CHB242313681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbf2b1e30c594a3a11db62d3c3a8da51d021cdca93dffbbb8c0dd709c02c3753. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/CHB242313682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b599f1f278ce0a1bef01dc6f0061b0a1ec33a33934dcd4772777c36a0828dad. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/CHB242313683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ab3275c9ae9e50e4aecd4d58ae1f5cbf184b3ce8f2e524d955276eb49aed031. 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/CHB242313684.