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 0x4288335f9e63b66067031a40d12b87d84616b6b41436f0b8658e7fdbde37d480. 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/3477fedb-00c9-4f4d-ad51-5e4de288a9bf.json and https://artists.proofprofile.net/proofs/artist/3477fedb-00c9-4f4d-ad51-5e4de288a9bf.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 0x193112cea3dc2e7d785fffd2bec7ae1628e3bf855dfa49cd6bea2c52f24dafae. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/DEU672201175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x251e8b2969bda8417246377c6481c180b40567f7962bc01870b4b500ace0473a. 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/NLZ8C2200268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b21e15b7476b6ff1fc31763d0d7e6cc79ba53ad0f3229b68be4edcc3b930f41. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/UKJEE2300084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8adcfae9c4d602426d1fddfb6a432199caf487dfabd4959e3998c2348803d9b. 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/UKJEE2300085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x080db34906480621212104cac43178ea880037c1ac5bc361dc107c90db3689a0. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/GBKQU2430820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x912b6277c4667358353ae4dd31036e5a64c9767f463cd64b24718065cb9af41d. 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/GBKQU2430819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x712a5a8d73cc47424a2be584e4f6a6f6e6c35c029793aed810c7fa434d033d65. 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/QZMHL2421440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36c3c6aac7432d19b3d1f6043104f74ae3dd30e0852b3f3126fead408c7a7802. 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/DEU672400802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x106fac71eeedea5868997fd6652ac712b9656efeaab7e36b056ea5e4d34f59b4. 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/DEU672400804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a0384d1455c27494a6cc31e0519dda24ea9e874b8c3b07b549088143850bce0. 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/DGA0P2494705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x841a9396fbe4eddcae45d7584c273b73ec400f8177134c8c3cb3b6369617df99. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/DGA0R2475228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5d857bc482549ccb29c8c4d0770722f2f884ef3ebd67433ca88a0df2f8ef601. 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/DGA0S2432803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0097d6ff65773cad6800f5e6c3bb3a6e3c2857efa5c073162cec1ec95c392116. 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/DGA0S2432806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83d903dfd3fad5421aaab1999e79333768149a0c241cd609377e607de84f8a75. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/DEG932406989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd857e735ad6735e591c373cb0a9b17efa962d582630730194f1614c955856237. 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/UKL4N1700305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb25cfb92f07a4de8d31a2c6bdb07adf0aed6d9b837b83bc7f258baabaa60586. 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/UKL4N1700306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5a24c5369ce2b5bd905959253c01505e72b4026b8d38cc8d7199f1bd9559be1. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/DEG932501295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x078b9e23057f9afb577f4ba9674065ac76ffb6c2168980961ec95e31ead05b53. 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/DEG932501294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x078b9e23057f9afb577f4ba9674065ac76ffb6c2168980961ec95e31ead05b53. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/DEG932501294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5a24c5369ce2b5bd905959253c01505e72b4026b8d38cc8d7199f1bd9559be1. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/DEG932501295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f15edc07a833147a51ad5cfde415dc00e6dd4dff037c0711e168ee771a44188. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/DEG932501296.