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 0x6a3bef22c3682c9faa97f510ed1732f8132a2b54f0560d4956581db1c6a6f89b. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8e7802be-9a08-4393-bf08-f8df19c04daf.json and https://artists.proofprofile.net/proofs/artist/8e7802be-9a08-4393-bf08-f8df19c04daf.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 0x4772b10263d4dd6698618519c633ddb7f826d2da2c7d1496121f659dc01d273d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZTAW2488153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f7d84a8b430023fa6b052045799d59bf8cd8220258b71c68320bbcf326a484d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZTAW2488154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x638332481949eb11613348b51fc530a81c227d9fac98043e6c9675ca00000ce5. 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/QZTAW2488155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44861bbda9772020f32a5ad23146cdb74ab77d0d8beae4de39c435f54846bc60. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/QZTAW2488156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe32847db425544c2e4013154f12fa14b887179be3546eeaeb95182fe4b51d450. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZTAW2488157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdad29af9d750200c12d8ce8a68af9bf429241b019941f6406b4a74e89de30b98. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/QZTAW2488158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bc289b19752e367675bd2cf924ba8b5d08495f8ae2756e728399699a2194928. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZTAU2489841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dd0288a2a51986ee1a168c6752b54fdbc92442708fb2b66d5f54438d45831f0. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZTAW2488159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f28eff247230dc5c505190850c443fb9a509cb59e2f2cd2d7d4dac6911cc468. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZWFH2392484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b862e4ad38cfa01b66b6092a0d6234af91108024d8e21a3ca953b283d44d34d. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZWFH2392485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc96d2835d3673d54f1297102351f3fa4f58e84a3174fc887aa793c67130a50b. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZWFH2392486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd28f8c4ba9bbc7738ae8dacc72448816109f211aebe51da3ac049fdcf031dac. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QZWFH2392487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68290ccaf96841f9d9a04e2ca1f39dc26217b03577fcb986115a18cf4f7d9b2a. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZWFH2392488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x653dbd5052bf90ca7fd9782913cc0da9448f9d0915dd5a2686e7094f1e227525. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZWFH2392489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19e1b8b0a9d17737e5861fcc808ac37d51607002d7bc042b297a1144dd453a0c. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZWFH2392490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe78e0951338ed7aaae655038c1b88fb14f5be53fec5373010a08fc097b343400. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZWFH2392491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28c758986d785a0350aba2ace3677bacf40ee2d898507189a1e9455fcb8e4dfb. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZTB32228134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5383fd72008b324b1883e4bc743f793831fefbeebe9c79c003b105eab193a418. 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/QZTB32228135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa8e5d6462e07f9f85d7c1025fbf542da4c9a36a0c30fa2f2a591b02d1abdb6b. 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/QZTB32228136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6facd7b37c179a25d68475c33b29d109ff35b7a0e92873ab55b34ae7baaab0c6. 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/QZTB32228138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3e0e4b11c06172194bf0088913e14ed6cb10239abbf7e6f6a5ddc8b117b3d56. 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/QZTB32228139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50965acdfc4894838b1a0d725b7047680405f9dd013db2af71382572586792ef. 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/QZK6Q2146397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb475f5d7bdf5f0071a2fd35fb3a2e019c1d55436c6dfd4126acba7bf5102f219. 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/QZTB22429755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64af63d60b51ce5f52668d749fe76a82c08125ed79ad2e0c8a416c88d4150531. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZK6Q2426767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacca58dc3cd9f4f70e76d086b0e11d51eed488e82c54e461c4063cc627f106d8. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZFZ62458938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18dae1e07be9454f1db0adf05db430dd1922007cb86f1fb8a76cc1d7f8490a60. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZFZ62458939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c5e51f8ddf6436d6169d3fd18fb4c502caeac305de1b7ae8452e08caf1698a1. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZFYZ2493489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76f320084a09a959d301e91126b6639d15c7f639fb76f9831c602c8894c19a51. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZFZ62458940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe476c1df8c0f04a599dc3416f7590e61d1f5bac7fb7a911c511be570d2a70d40. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZFZ62458941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c5e51f8ddf6436d6169d3fd18fb4c502caeac305de1b7ae8452e08caf1698a1. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/QZFYZ2493489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x103b3ed8a4f4d520ec3756e09b5ae08857f523dcaa196b228ff8074a24c536d6. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZWFE2359104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7bbd6bc92aebc8c553eaa7aac5ca366deef39f305996e04d2ad3bee3f383ce3. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZTB52360832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81fca3991b3902012d4b172e9e2f8fa982ac8124794961041ace40414c9ec507. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/QZFZ52101654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7b28479b8842f119182549f3432f1b352c20d4f381d223cd04f1eda32521b4e. 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/QZMEP2024989.