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 0xe4190e1ed335fb4c9d48e25cef66033d5acafbe8497482ca9fe71c00eb23622a. 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/77e0c33f-4e81-4c3d-8cdc-ada276370811.json and https://artists.proofprofile.net/proofs/artist/77e0c33f-4e81-4c3d-8cdc-ada276370811.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 0x84da8fcf45130a40dc762473b44464369648b9edf4b0be5f848c4c8a6895ffcd. Chain 2 (Bitcoin): anchored in block 958654 (2026-07-19T03:55:30Z), 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/QZTB22310702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f2122bc356c550787824166383c84d7c351564d9c728142965cefad983db3b1. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZTAY2405258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ee61b716d39f27f33218cec5721ce2509b471e1de354a8f7600e08df4dad9cf. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/QZTAT2498986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc7c5dc8be82e82982fbcd6ccd1bc5f795cd4650b7fddc9938d4dd14e4982515. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZTAY2405261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e9540dcd20dc7e9744c9243d5b69d8e0a15bd94bbb78f14a34f42fe7815d9b6. 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/QZTAY2405262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57bad86e5d6be7074ea30c8a708e1cd1eb43395eec49a6ca98235ccf3b6d321e. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T04:46:29Z), 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/QZTBB2469588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc84a7c6600c01bfce0e96940fa58dc681d18feef90539622fd889da5a9b1fa29. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZTBB2469589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb646f119a0cde75fa86bae328bb29afc85bf86f28fd2250ef3d95121e1e26f15. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/QZTBB2469590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5643c9e4d0e3e5df06c6fc14daf743ca4aa96ee4786359fc484c534777edaa3b. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/QZTBB2469591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a7958b9ef7ae4168bba8a74a23c59db2388dd7c8539bb7ebeda517c1a9cef17. 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/QZTBB2469592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf65dd0fc1f0b8776c18790edd4803c959fec1a75cb2271585a273884c34182f8. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZTBB2469593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadb338e1084e816cb186ba637ed4d2d354c235601d6d4ec1723ec1ed8bae16f0. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZZ7T2430418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c4dc92b635fa7ed7e74a27a672b7e330cc9572b8e0a150df75e2a24aad9c488. 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/QT3F22406730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6f85a78182625d15c4ae1987b7ad0d758810a26415128f5db7aa763f22d083b. 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/QZHN52599494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf4cdf1eb71dd3e364fc0cb188943e8cdb1c494025bcc61fbd9da0586cf907a9. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZK6N2518607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1554b74e9079e3996f1a2eb8a5389cb1d320408b17c63100830c4be78aad53c0. 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/QZMEQ2587410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1554b74e9079e3996f1a2eb8a5389cb1d320408b17c63100830c4be78aad53c0. 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/QZMEQ2587410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b372c7a77b42f89aff6b05b96802cdf1c0aa4458a997251582d96368ddcd2f6. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZRP42561105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21f19862c20af5359915633d83a49b1ce058953baa0e7845a89eda669d244c98. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZRP42561106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb5be67d735af94336366b07f82dc8a58e05a7822075a0bb8504da416c1fc6ad. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T07:50:48Z), 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/QZRP42561107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf2e45c10ef9ed20e5c68bf5755fe0055880591e3f6082684439b0e342e6a249. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZRP42561108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bf04fa5509e60ac6187906c288e8aceb57b454d0127aef782b7eb7a139066c8. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZRP42561109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7846613275433706b34a36e8772b898ccf160bb8ddbc433000eab2a524f61e41. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-17T00:58:31Z), 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/QZRP42561110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf16d8bdd049a5f4c48c5b82cbcdc36d16de372b41f61a192d8107dfba70295e1. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:45:06Z), 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/QZRP42561111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cf470f9be6a2f63d5f6658fed0a9796df37e25b2939fcc7271cfda655802558. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZRP42561112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0dd9df32e50c186b3978185d318e2746095ce7e64c8120973779d09700de0e1. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T08:03:37Z), 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/QZRP42561113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10f2c8dc03de9f3ff30295c9b2cbaae61adf11eec5c455ac1be5138c0a3bfd33. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZWFQ2329991.