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 0x6b639c443ce702ee223601f3c7801f048a8a304fe7ce54f104622adab89625e0. 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/6e5dc4c6-aac2-417b-bdd9-f04b3f7a7628.json and https://artists.proofprofile.net/proofs/artist/6e5dc4c6-aac2-417b-bdd9-f04b3f7a7628.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 0x81d8bb0f6d5ca5f78758f593b540602ffa1dcb1941980ddf5a53fad5fcaf8409. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZES61905438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78a29b0d2a3d69f2716de3c81c3976785b04b23dac6f08d01279ae5bf516b6cf. 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/QZES61905439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x496999db3153487c2fea79fa0f662ce8d2180744b18c0d814684c9dc460794d3. 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/QZES61905441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0268e0ebba7ae4f58adaf76ed2f70466898d77701379d01feef57212a4e65dee. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QZES61907306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1506d5624a99475d43c436d5a76a618ce0f007d1e2dd9e8385926f2858f5e347. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZES61907308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x489d14b1508cf99bc674cd7088f99049e3a934b022a4544b69766044d9420169. 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/QZES61906325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb97a79ae2f90ac2c3250e37b4ce79484a8fe4e32417cde7f8af84b56e762fda. Chain 2 (Bitcoin): anchored in block 959003 (2026-07-21T11:57:43Z), 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/QZES61906326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bc01b350af4542b540d160afeaaa3d69d302b7629f7c1b3dc5e7e62f1030d8f. 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/QZES61906327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf10479391cab160b981735ef3c21661d0796fbaac9cbe948cfef61cc86b099f4. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/QZES61906328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8b25714c0b7a3f7d8f95158f6da266838fdee865816fd8098e68d1c8dd072dc. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/QZFZ21937337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5577841fc04cd5d7b8b2aaf502974a32b52730a309884316fefb8bf2f64b0da6. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZFZ21937338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80a0e2b32bba48c7bd7173056a728ccff6b813fd04e4290cd4a8a814eeb9b09b. 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/QZFZ21937339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60d7564a5c37e4f0e2a7431850e9a71a553666c79087aea1d9790ce6206c454c. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZFZ21937340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x293448b16781b01809b50689f91209c126499fa8461b782d49bce91c7818c3bd. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZES62046596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eab73fc3c26f91ab52d6d4d951a206cd4c396c2dbad50858e54887bc8a2cb90. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZHNA2075014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8265d9e4cdc8f5d2f79dd02a4155bd3aea901cb15651181e801179d7cefa8401. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZFYW2131928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e9c6ca97ed95e27650aa71883042ebb7959c4234826e17dae5178d2360f4a2c. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZNWW2016467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd286d210415b21e90e5d4f09f243ee02a3e4c30f2f73345241111009f2aefedc. 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/QZNWW2016468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc222ed6a5ab6a65d9dbccfc6137f47c2753519c44a051c181e79b264d436b4f. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZHN41906142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21954ade512dae1d58a35dd3732188ba9fd0b3c9170d455feea72a182d804113. 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/QZTBB2497669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdc4330bffcb2eaf80b449e52db6f8b98ae95e7c4d51ba2deedefd4b9dee5ef0. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZTBB2497671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07122827c046319210a51849f4938415ba34c56595095fb8bd8f99d0966ac5ca. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZHN91991190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2d471bcf9e25ba4e38e45248109bbf28c3871066e3379b84fb038eb24bf6401. 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/QZHN91991191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa34e4268c043839865e521a5973b2993e9afe6898276c1bbbf6265c2efc021a3. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZHN91991193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x523b59a6f2df3ff43186c5ce570da7aef7f23c95842e4d511ce857f9834489e5. 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/QZMEP2522487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1bc2fef1cc34b851e9ca7d42b2bf21caa925982d7bac0d47034ca3b5a32a405. 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/QZMEP2522488.