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 0x3317d165210fe3f7ae8ff7deb5835638c05c4363d8e9bc3322c96d164ff49174. 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/ab76d8ef-1e38-4fc6-8522-67e14978ef87.json and https://artists.proofprofile.net/proofs/artist/ab76d8ef-1e38-4fc6-8522-67e14978ef87.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 0xa40b2e250ff2109b1dc5101392ee30f43e76b2c53c1ef6e171fecc3a7922bee6. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QZW9N2221713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeba9ee7fffb96f01182c6fd275f1bb85711ada8b6112f8fc3590397346e70fb9. 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/QZW9N2221715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51517043c5e1d56ae71732c395e2eb8e5359b7c6c27316c422a4bc1207b8fc79. 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/QZTVM2364111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff60516081955902814c5c04e989d70f23f1e0ea56dcdbc6c58619943d4c8f48. 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/QZW9K2316805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4650c45fda9203a469f7b6c983317a902e1e0ea3148dbd389575e608d4b879c. 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/BKHPJ2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bcce19a63197542e1b3d4164fe6000602f54e333edcfc6ebbedcc1eefce52a9. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZWDD2432661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf49aecaa8cce8bfc5544d9021818d6b0649bc134206f332cce97d84e93f5844a. 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/BKHPJ2400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf49aecaa8cce8bfc5544d9021818d6b0649bc134206f332cce97d84e93f5844a. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/BKHPJ2400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc86cd4427886085c43bba94ef5c00e26a528c7e5af322b23d2f1ee4a46e13ff9. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/BKHPJ2500013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0cfc0618c7595cf642e5ec8f52daeb2ee299f5ad498dc289a6888bcef846994. 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/BKHPJ2500015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99d2ae9e6b360072baa8b61b84b1f2db30e110f3ac8e1759385713609080d1b5. 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/QZZEB2321670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fef1ece20da194d4659100a3a12fbda614f4775584b2766ef9926772411603d. 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/SE6QE2334833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07003967826ea5da61e06c304306b5fdb50f0ee9cf9d4d6e95ba8db2cc7e8b00. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/BCGBQ2100013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdda2342e03e9bd468d862022b134c6956af4eed4103cb98ec7b10afc1c2a0fca. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/BCGBQ2100018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87f74418001abb23a95dbaa73f847aaca46b44a3e7122fa28e2e1a859e1d5175. 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/QZMZ92156624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfabd0f6dde2228dbc9f9b9207f4eed922dc45fdf307a38035403bd6b547528c. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZTPX2296947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd78cece7ba8b2fbf480f3ed0c7c562bd461e5a53ab470f1c5751f9ab4496d996. 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/BKHPJ2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x855d97bfdf36fa69447c3679ce57446d90c72317c30317752f42dae4af9d1168. 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/BKHPJ2500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc312f5c46d9ebfde23134a958029f3b8e632d75e493bdf467595d87aea2f32bf. 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/BKHPJ2500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b8cb0ce6748f0073bce17f598a9fdb053dba9ba6ab8c099f7ed7b23625f033b. 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/BKHPJ2400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dd3e57505b26f5777209e41495f27c3049afa0d76bf170eb636d366c35558d1. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BKHPJ2400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69cdf1ed52b80d738a67f24e4f99a79d89e0cf1133d11734c4c11a477f11059d. 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/BKHPJ2400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aefca6f580ece17ab58a68b4f19437e8b7ff808313fff443f4aa929e73442d3. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BKHPJ2400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aefca6f580ece17ab58a68b4f19437e8b7ff808313fff443f4aa929e73442d3. 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/BKHPJ2400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7b5137fdaebb795e5d1675cfb453ab6f08e7ecf2e49173288c4d910fbb6ae96. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZS632222679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8515a81bb78b018db680fc1e34dbefe2cc8c90d9739ad9c26fa48d8b950a4b24. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BRWMB2301407.