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 0xf58db0e2146ea20da0f445868d6a86d78c5d6154fa9bfdc93ce7a248d4998918. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2430b5fa-1622-4b4b-8eb9-1f34c961fb40.json and https://artists.proofprofile.net/proofs/artist/2430b5fa-1622-4b4b-8eb9-1f34c961fb40.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 0x8b93560a2db2f41d8e5651324d7080bd7b4584d2610f93d5b7fc4c04bd6f0a6a. 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/QZWFR2476832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9dbcf254902b1937158b1cbaa52bb432756de8f7bf70aef04d6c744d4f38801. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZWFR2471762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8e28476f4b89b7dc15381be1e8312f8af234b9b6fff00a00ccd9ff1788e4435. 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/QZWFS2413114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9718af4f1ee833db2e6a895a70e2e54fe8218165dbb28afe126832a7af0ed534. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/QZWFS2460655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eb30278bb714791edd463f75d7d400315e4da23fa42737230edf03cc4f516ca. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZWFS2460654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceb52cdda0c06a069cb265b2d16cb35531a24cec917d2bee2a3b773069469c3c. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/QZWFT2444766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4212241b4bb59d3f242c3ea5aa9f1d5a4a4f212d4c4d9a72a9f1f861b00550ea. 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/QZWFT2441820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0731b480f7649956d36f9511dd0b2dd4cd4160f7056f3c6885bb1143817008c6. 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/QZWFT2494006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83238fd1f030f9183be1b508684d6af399790274369055a59a43238d75912684. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZWFT2494911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d0c0f9a5046945ae25215f74099a20b97534b943207f7db7f376c9d829ed9fd. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZWFU2428381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dff6059cae9810a5ea98bbda44fa870ffa77e0fc5df9939d9688ed107262a4f. 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/QZWFU2426537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc297799a17280d21bf2abd282c0540937d1567323bf9bbd6e1663e3ef9dae72b. 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/QZWFU2428379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4c029fba889a9854507920a9774a22778f3cedb779bd234e61f4a000160fe3c. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZWFV2492522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe27ff5f0613949be79747c2d53e4b168699dd11491ebe80753f09d6b74d1686d. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZWFV2490858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c188a2763adecf58d2b1db8c1cc8d715d252b4e162306c5763a1c7dd6dacaa7. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZWFV2492546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f1f9b3d03ed1afe561b09a0a63fcfd8d87249a5045c94fb3349416e9eed9ae5. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZWFX2411068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2481453c9a4338175ca99b38aceac928c65130c2b5490ab8462a505fa7985d13. 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/QZWFW2429612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x803ed96296503a76c7980c2402ee079b5e6fe23e952b3d49ad5ca58a2c3a924a. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZWFW2431836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb55a0c8b3febab9bbfa5d725824f127e6aede0d8d93b1d280fbf1f19007f3a1b. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/QZZ792402246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79e1f18c78986e325cb60d502751d957f904db30b1dad0921de61c1c4b975b1e. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZZ792403925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda1b8cd9b0078375dd3beacc95cbb97fd02f1131e845bf1e13fd8298f2dffd02. 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/QT3F42421973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0785e2cce9541aefe06a713caa3599e8b215b4b312b062aececc20b1ecac05f3. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QT3F42421966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80ade39c546c53873d046a8aca8c4c7ac88d0467f2381f434ae5e1018682a5e4. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QT3F42418662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x320b2b85a1393a1588cbc12219019e9e44b841dfe0a4e6dde5817f342a6c67ed. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QT3F42421951.