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 0x1412f624456adb559cda6ff38a08c66ecbca6dcf250b213d186f3e2ae1303418. 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/39960f98-c0a6-47ff-a900-464669302fac.json and https://artists.proofprofile.net/proofs/artist/39960f98-c0a6-47ff-a900-464669302fac.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 0x30303ef519800bfcf731a82b9b4336196cd357f3f6ec48c068208d5998390666. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/ES71G2336161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9982bd71911e36f3f58956695288b84195f0012272582941c59f6a5c4b4438fd. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ES71G2305389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe37fe109867e4c1b2d58159ec14686419c5ab3613324bade48a44cb594ddec3a. 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/QM22L2401879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60f100025ff4e60576be084e3644e5c467166b154f3663fc1e3f5382508191ec. 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/ES71G2401408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27ddd3bdc5cb16de39bae50190ec0b8ee0c1a8e59efc14a97ea27d6e2a42c5e4. 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/ESA092318883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63b78ce33e50778bee9547b410af35407e1f15f12d2a16c434435f22499ffe5f. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/ES71G2306256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9982bd71911e36f3f58956695288b84195f0012272582941c59f6a5c4b4438fd. 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/ES71G2305389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47545a3c120310d08643d73db83595f2cace0e1240866872192c72c2777f0dc1. 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/ES71G2306257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90537541ebe0359109bc4292cf9d5d5c27a9ea00cdc49f853346fbf6f2d7e3bf. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/ES71G2306258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6bd80e03178592bbe7c9119c87188182dd2f9ac7be362d74c67f7f294f4380a. 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/ES71G2306259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa58eeb0aa2a369c64ad2d54dd5bee4c077314c4f687b986ad661f8afe426500e. 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/ES71G2306260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd03939146307c4b9add9f5f5853744d93693d94ce7e7f10898321a61077b5e45. 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/ES71G2306261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7735a7b212abfb7a3f124b3eeb0ad84beec401781ee671ff8bc0588a5e55bc89. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/ES71G2306262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f99e183ce8729f6b7157b6d4470d14a631be5c655c96f3cfce8c8854edbf542. 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/ES71G2318496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7e925d88f004e9b33a8da965f6d5de13d5101a9a09257e0c2b0e4d4de1ee172. 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/ESA092233733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68852797802aa70d73c8e03e5e13922fe879a623785056c32760a224b2085d5e. 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/ESA092228654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ef8848709d0781c4d10dc6212635d68736f14da47099e3c13549899754e28c5. 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/ESA092220659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe355f15047b8877d12e53990cb9c02435ec5610b04482217b38074b85b32f2a6. 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/ESA092211200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b39cf3fc51d95b7696e25c379a6913de077eacc563ef4dc8ec02a1ee7482619. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/ESA012252960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d6a34e1a61de3a8ea381f99f37edf81b9a5aec53e3ce001e9b911cd85e6d3ee. 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/ESA011589611.