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 0xf15b61074cf5092f24ae4744048cc22fc37e816fe9bbef6777768d84709fffda. 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/a7763468-58e2-446b-86f9-8a064e7bdc8c.json and https://artists.proofprofile.net/proofs/artist/a7763468-58e2-446b-86f9-8a064e7bdc8c.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 0x6fdf8191157ddd9eb1772c2c1f279a177575ec2d262b867c9b6dc9bf0d4980ef. 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/NOCEM1594040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09a5199cbf0f8099e6e2cf3e75a43c82697cf83bad4d91dcf0250fbe4174a72b. 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/NOCEM1594050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21a032c0fac17ebfc975fba1b0e16765e74013e52b8128b72ad8a0cbce57c4f9. 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/NOCEM1594110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03dea69fe67c747a7b69a1ceb407bb089fa8513ab5b06594c920900b742cc38c. 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/NOCEM1594120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45edbd98c5fc098e6a268e5177ea9c03df51d402f2e077176ec7753d364fb280. 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/NOCEM1370010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f95bc369fa12f0f8125d13d54a3cae198f0b9f56c30ef2060f6cf0ce2099476. 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/NOCEM1370020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd6b9f6bd30929834ce9b69ff51d9961c5a3b15805b75e3201845e80e2723d10. 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/NOCEM1370030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a267445517cb1611945b9a3749003f6c646a21b38ee2b333e0c1029dcc4c6db. 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/NOCEM1370040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3417a138c65f4c4edc85e3f27354f52056215fb8170216c0e747d5d6ffe05c25. 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/NOCEM1370050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa798baec19a17a01984bd2bc54bd2b988e74aacec1d5f758b7a7b419a4f713e6. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/NOCEM1370070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7781e5b6e75c9daf0e1cdae27760ec6384dc33c6b76a84a4a35768ea0968879. 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/NOCEM1370080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb19931e89a3a7f1039a2c053b7c57c22d37f15a17c1dff87154df9b703164ae0. 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/NOCEM1148030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd76ddee08d0f8755bb819c097a850fb282466a5911f129fced40747d19887f1e. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-21T16:44:35Z), 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/NOCEM1148050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfa3b245d946e91e3b54e2479711ca678e00c62368c66b1e0bb7850da5e40974. 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/NOCEM1148100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f16f07a25b8c6aaf517b1b9c891c0abfe810eb810316d5c0506ad8877ea2cee. 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/NOCEM1148120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x001c0c076bd284c5c06d4a26c78e336fdf470760bb6e0681b0d91cee553cd917. 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/NOCWZ1802715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb02febdf2f34e74e3630dea89747d1da6780fe97f661f878959a0a75831f1549. 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/NOCWZ1802716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48ca58b5c67cd9a101e18b3b7cdef9ec759636b00a61acd037f452452e82a13f. 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/NOCWZ1802717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb6abf43fb166d9e1e2a8be15c60a3690c87f9dd658fe84ce95b82c7eee8f3b5. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-17T00:09:59Z), 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/NOCWZ1802719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x188ffea4cac1e07ac655599385e5776e1b2aac08da1418154ec8365921508ec2. 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/NOCWZ1802720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05b1639a3e9d5f1141a16b3af5a5bcc4501eabd5ec8b7f24e37868678426e3d6. 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/NOCEM1908010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf669d0da051f167fe616283de238a652987abaa007209faa1739275ad20d3a80. 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/NOCEM1901010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eda9cb4e3e60671678aae6b5d791913a4a041e8842a77f3f8f79cb4b7e4046b. 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/NOCEM1451010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x379be970f1bfecf28f26dab07029f0cbda57d81e89427e9b4c26b6666b7ba620. 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/NOCEM2403010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd84c533f66baf4e7de6d4158f4ce74101829b22c74c551cd58debdf940e72318. 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/NOCEM2501010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f7bed936d6a39a8f5b690e1589db33e28d1fa0b26094708fab3bca5b348d96b. 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/NOCEM2432010.