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 0x674f17ebc3ef33faac7708181628ec9df22493a6db81056fa836dab679cfc338. Chain 2 (Bitcoin): anchored in block 953759 (2026-06-15T08:04:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b1dd6fe0-882b-4bb5-95e7-29dfe363c837.json and https://artists.proofprofile.net/proofs/artist/b1dd6fe0-882b-4bb5-95e7-29dfe363c837.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 0xddb657e22d3f81f03161d12f8007b45ee632a85f822daba048e6e14c74beb265. 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/QZHZ32200231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d0d2f6a399f4a933cef99e11509940575955d75c6cd6f6bf883920ca0a6eed9. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZHZ32200235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d741ce781accf07d0539f890715e2852345e164ea3bc72ff4d84562aae53525. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZHZ32200236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1ba049cfbca00d8ff50b44d3e3220595b8d251b352f686504eb45b885a3cb37. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZMZ92230217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c846d6ee89553548f667db13b3af973a41127c1462df3719e03460e459998ef. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZNJV2262310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe771c7d4e073a2059b6a5c12a76c0f5c1a9f93a58e9ffa10a690cb63ee1a667a. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZNJV2262311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0e90794a054f8455d1023e3c244883d369666399372503a753c3d740a7ef4f4. Chain 2 (Bitcoin): anchored in block 958487 (2026-07-18T03:43:59Z), 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/QZNJV2262312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13b2726a88d6fcfd23d9f215a2c95d5747d8ac42fa6dfd2546e208aba4d9b9d8. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/QZNJV2262313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4051f7289891632ab4607023fa2e185056061c8d4c4a1dfe34a4b683cbb92111. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZNJV2262314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0e7eb404a943f9efbdc0b4b305f7d02212c27c9212f24bb111f833649b4b136. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZNJV2262318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc61e0a6d8251691c64a67cfae32cead22a3709e731085aa471175b84e6d8da71. 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/QZNJX2268549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39a0c8e8d316b3e3df63e1eba8cf95f4c076c62bd2eee903b09e64a0d44235f8. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/US7VG2380478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe45966ce699baf5d6db97f7fd1e51e76e5ece5e6920a9f2f241916e65b4a7be. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/QZMZ92436029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7e9bc8b534fe13c25cb3449106759b1d1ea3b9512482a9fc1358863643a3585. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZMZ92436030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fa89a34df9c93bc2c4f2aadceca70d24d127358c24f79a0b3f9d1085947c976. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZMZ92436031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd82e83df591037a69e016552fa9333a6e915a2a7b4797a1abf1fae51b6dab079. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/QZMZ92436033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a3d72ec5ff1c3e695c4173315d0f1f97950c6ab1fd2571b09a3df13f05ed5e1. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QZTPX2493372.