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 0xddfbe5f0242aafe627d4fc3964fb58b629d59eb870577c2955afb9961ca0b5a9. 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/354543e7-8deb-470e-8a79-78647e14ff2e.json and https://artists.proofprofile.net/proofs/artist/354543e7-8deb-470e-8a79-78647e14ff2e.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 0x62750f03fca5185d32ddf07c839ccd2cbe8fa70685c9d52bfbb41cc3016dd9d0. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/TCAEG1969101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6be4c962459db660755d59062d981c349366f16fb44047a52949d41fe4a08900. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/TCAEG1968867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf1230a47c279a71b5a01bf75b14a1cae5044fe2dd55779a07c1383b2eb0b2c6. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/TCAEG1968871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84767bffdb47f36485cb68b1f7bf9728a390813d6e0765c97fd16b6ed05aacb0. Chain 2 (Bitcoin): anchored in block 958342 (2026-07-17T01:09:53Z), 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/TCAER2098081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a1944c73976e8d2a0251c3a49fec66d894a07d7012ea3cdca6ed2d099182b97. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/TCAEG1968915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18eeb5b97980dd8c6ee411bd4a3992c67648a67c243fd8b5cf96875f5e84ccd4. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-15T23:25:50Z), 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/TCAER2098147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x255cb4252379c8ce55c4075593a852554100af3efb05fc8a23aa345304254c0f. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCAER2098293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde3d5dd8d13f93545509701b5a13848f03b638f3f1051f9d623b1d322dd58b4a. Chain 2 (Bitcoin): anchored in block 957697 (2026-07-12T11:22:18Z), 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/TCAER2098159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25520712aa981239d72f5cc0fbcd7ac19829c58941861a0acfdf67f6824ea508. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/TCAER2098161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x343576cd863bffdd5755b3d6c1b572df3fff124036ea929413c4e793f2f916f9. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCAER2098165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62f29794e93e8cc7ef95098fe2ce34ac3c0dd86c61d0404c3fcac4209c5a0917. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/TCAER2098167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ea6a39aa835a51fdebea69aee999e9a7289e43d6a1dc6d0c9062ba4a9d43c46. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TCAER2098168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2caf3cb6b606206d2f92cf2e0b62c12dce8b1aae10bda38f8ddcbc7ea9d3bf88. 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/TCAER2098172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c95100068620a4f16f037ca72d28a0d7ea4a576e05c9e0608c9a2bd52d5984. 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/TCAER2098179.