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 0xb34db7e855e353434dcf426907297b7873e4e0a5337ae346c58a129afd96ccb7. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d4ab2469-bcb6-4487-9fee-1daadb2dfab9.json and https://artists.proofprofile.net/proofs/artist/d4ab2469-bcb6-4487-9fee-1daadb2dfab9.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 0xea7aef6d3fe1a59be85cd0a3434a635a1a9774876d0320eb227410319b4b105d. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/HKG732429194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f2953cfb4080f5ec3462e741350d4c587ef4cfd3f7d36ac021b79a36dea1b0b. 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/CNZ632401093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24072459ee8c889fba0f6f03a5fa64965acf7b1a6da35ec6ec6d0381f329e7f3. 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/CNZ632401094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3021387fd76d4b9eb35b176b87cbdd882acca9d9984f1473f0d604cb003ccdfc. 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/HKG732426270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x285b32da61d45b7c4b36809f37cfde0ac47ed295ba00ea8384a78436c2b09558. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/HKG732414121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf41487e7e4eda91a8fd46dfba9f6e7486f157386ba2375a77972810584b12ef. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/HKG732411866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7276459d8613b5c68e0767ec65eb2bdc6bb503b04409d7f91b4a64f8e0ddf98. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/HKG732406734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19f9b696e14db337eb576a8f5f6f328734cdc881e7b0361dc93df434ccf82c6a. 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/HKG732406282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2f455e56dbc142246d7ee9497545ea271ef5bab62946585cb6720fb23601bc0. 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/CNZ632400581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5e31faa688f51a0cab72ab9838b761fa5ad68f4626524a8f51901dc403b2c32. 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/HKG732404505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26e6dfb70f3fe28ed320973178e1234f8670de4769044d99f6dc4b86b0f64f3c. 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/HKG732424377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34b65e0ff527175e46d64451154fad11133f6e565aa87170a467eb4abbb8fc75. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKG731682797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7874046da6daebd55d00157d769295c8178f8b012f921272ad62eaed47a18bc8. 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/HKG731682767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe44ba499cf5e2645a1c95400ab901a7faee7d31e62647718ccadcc2630633559. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZZ972499262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee0c724d377c05fb950e08263c0824e1964bc78b4be4e0406f74614793354eb7. 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/HKC992325628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x964ef464854dccce23588292cbf9c1ccf9a097a6f6443363b35c6e7651ac9949. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZZ972479953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33a618a697fd59e09e25055e537e9b63f4b91e71a725229179a7fdbfbc0e2a54. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZZ972478858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf53f07808a7583f01f7828760f9d3f57969c1cc2137108889c5d1ffc8dfa1b0f. 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/QZZ972479713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x436f4ba388a4ee3c74c2327cf10adcc7ce100142570cc94e56be1fd008d24869. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKD012237793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68e7e2d2a1042a743cedd65025ac5914005d7e1f001d8c0e2cf3222dee53416a. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZZ972340405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7e43f4de25b04f7f5972cac0f06a69626f5c6cfaf0a3828edf4b80edbd46724. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/HKC992324576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd14b5740f8d4c9aff47c359acf8cc45078439a656172723f8147000d0b0ee3b. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/HKC992324565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33509aa663efec75127669c120b3c00d487a4c608dae7132e3c458cc414ab10d. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QZZ972479948.