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 0xe268c9c76a2fda7c9c2d8a6c3c1bd11cbe04e3a72b3cb012b58bc303f06d0e0f. 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/603d8600-fea5-4abf-a9ae-42526d43f753.json and https://artists.proofprofile.net/proofs/artist/603d8600-fea5-4abf-a9ae-42526d43f753.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 0xc29ade0740f96020f810ee7b5a0b1d9f1f44767809dd55a53c681faeecfd7e6d. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCACJ1599885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e288bb2b9e91be2bed44b3e539b910554a887b685d9572eb4658cca73b13db6. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/TCACJ1599888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x252186f22697f2d286153a43edb8a5bc2c3d61afc7d3d52ad74002f20e6c5356. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/TCACJ1599890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89a0b4040adfd95127149b0e8e36f42ed2c58c876d7e4e386ccb7559dcad599e. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/TCACJ1599891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd049db95874653ded4e06b5421d0e1c118f1efbe8173928a078e9bf8a43d1e18. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/TCACJ1599899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94c9545580948fc3fe87393bf448db7452bf9c84f871b4e06325536558e567a0. 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/TCACJ1599900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b042835125f7e0ad0b2b850d5991546be258d3666bdceec2db1ffdd6d6b640. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/TCACJ1599902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54e5b85ac25bcaf6f21a41aacabe059ed4d2be3d872886bf77eff22b75ddaabf. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/TCADT1844536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02a693c5e5b6009eb90333e9ced89f5e81e5501e5103c533e25b16c382b21d93. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCADT1844537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a20a571b1adc5d0e2a54e60135bc03b64a6660dea434c6a14f7fab166672598. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCADT1844538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe80a3715448984e739815c5cffefb8c6722615aa3501f4e474076c2133103900. 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/TCADT1844541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb460eef44a38c8037a8b809066e339102f61d0560f68efa355eb3c1457f40dcb. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/TCADT1844543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60f68fa87ecb375340a967bf697867fba4b07eefcf6f20fbd6ac7ef0db091d9c. 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/TCADT1844546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eb23a5849f1d471340619c873177a25b7a3a476cef2b2058a99a266e5db9bc4. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/TCADT1844548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbc5a7d275f60183c9786db7463631cedef7eed97be940917addde90e0e2b876. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCACK1500073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7003f6dac87160d090133b006af52cb62be2ac1b464b1203026589648f67a6e2. 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/TCACK1500080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fd2605159247bdb8f23b79e24238855e38ce804aeb525f5a7f02740ca19c3a4. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/TCACK1500089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xace53cb452621b35dc25d79b62351ef1fa64b9cb4799648eb2840a1034586d91. 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/TCACK1500093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x465ad7513dcfa5584cdbe6bb5854040719edc7e1e267656fbf3c06fd1a37adf1. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCACK1500100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x631cb03e1d655033219b213757a915b43f84f352fa8df64d12e797a003d65a6d. 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/TCACK1500102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77ec5f9ac5562e8dc50cee454bbf84ab02be00fcf747ab709fdce15a149d8d90. 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/QZTAZ2386382.