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 0x3e4ca00eb6c17f595c98bf995770adabaf765fa1daef45e404cf17a74c1c045e. 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/867f7b1b-ba84-485c-8c8c-c3a5151ca6cc.json and https://artists.proofprofile.net/proofs/artist/867f7b1b-ba84-485c-8c8c-c3a5151ca6cc.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 0x69b7da92d37e2e0890e403725905b08dc5c377523482685aacc96fdf30ef2489. 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/ARR4B2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80639af687533488326459c56bab49611e59b4882bde74c19d84751460133eff. 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/ARR4B2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69b7da92d37e2e0890e403725905b08dc5c377523482685aacc96fdf30ef2489. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ARR4B2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0551ab4076594960bb348e12df6f011c3c8292d7833a034fa00115a31ee7689e. 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/ARR4B2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50ed5d1f4b60e067aada38355e1871c806d7b46ed2c54b45eca9ff373921e79f. 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/ARR4B2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x948c2e022ea529e67571d9b6d69e1783ac73a3aa6b59b37fcc7d7b5ed86a24b2. 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/ARR4B2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71c1297bd532d4a1f997eff3ba307013506b71b11467881c2d51b157df491b1e. 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/ARR4B2300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ea96af531c5a0961c825514bc59321d3226c0cbcbc02726f6ea0aa46af085f8. 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/ARR4B2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99997d7f608c4fa9724b546bd5d38d3d0d9f7d3aa0ef9f51333476893b4f32ac. 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/ARR4B2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97f8440939dfaaad834f778ea69e3e8e77a57879f7f2cecfcaaea9a3fdcc5c58. 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/ARR4B2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9decaf5eb738a7926c6342ae37ba48979141787c343d0c86d3212d721e431465. 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/ARR4B2300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e11c54d48d7a733e289bf5936978a494908f4aff274402220cc195f44d22592. 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/ARR4B2300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd83352b8d30d780c831217195a40c04abc72ea0869bc0c70721ac57bb728c94b. 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/ARR4B2300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95deb16157de0046544ec5bc0743d4f5e25bcf9342d3b277106c1c80ad470950. 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/ARR4B2300036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf727c57b606212feb5ecea52b85ba6ad060818538369a1ec6b0b46d617eae0e4. 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/ARR4B2300035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd56e002858c1c0c6723ed3f8380ce229f029c7570c461ea988c29fc2fbc7f3f5. 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/ARR4B2300038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29833af8f3e06f4085761f8b97f53feca26ebcc641b2da8fdd5a5f2036f0fa1e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ARR4B2300034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76f8b92d4d4359db5db6d51eb0b7f116eff88c99d4f38a622922b75ef47b94fc. 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/ARR4B2300037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50ed5d1f4b60e067aada38355e1871c806d7b46ed2c54b45eca9ff373921e79f. 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/ARR4B2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea71aef1cb16b5fcc7e231ac33933d26cc77621eac8106ea42a044e13eb5bfb8. 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/ARR4B2100040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x858a58ac4d8ada094d654ad09c4652bd1f102e6f8847fdadab4bd763a6489d13. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZMZ92084502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00f31a4c6b11d8bedd7f988b648c16b605a72c959dd2676d1d274dbd835a3960. 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/QZHN51974499.