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 0xbb1a2781316f1d083f67bed78c5960bcfdc7faa711ae8c3aa2f8c527009575bc. 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/87bcc2a4-9ae1-49d1-b864-12c9d22a62bb.json and https://artists.proofprofile.net/proofs/artist/87bcc2a4-9ae1-49d1-b864-12c9d22a62bb.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 0x6f305a1e90bf5bbc1cb2e94fa890a790e5a47202f3cc0641718e659b381f7ff2. 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/BKESU2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1c56f3276e195f948d986f5f13172999bce01b0128a8a849f46ebaff1291c61. 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/QZGLM2395923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x099221b0958ebb66068a42a47fc15a1a65dec2000cae2e49b3ceacfde1e70e01. 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/QZGLM1998338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e27f560d73191bfbbb8b5f7706fd1b501c5a7f501ed21467f7c24f55674931e. 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/QZHZ62083236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcd4f96f8cd00be3fb66ff13f5acf63b8662b613d95b59903697a11b27016add. 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/QZNJY2141313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fe8af29e496f51e03491d7d2ca4beb6de3295686b1be4d9f82a1da100d15824. 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/QZNJV2283501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d6e439c87c53f92f0efe40b02158d6e83d8fa70c341ae0989efe8f53e9ec23e. 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/QZHZ61915210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57a2312116c8eac8ba3a58b74ebf4a1268f3517e9de7d2dbba0547a72805e9b9. 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/QZNJX2229847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa611f1f47e2e07ecbf9623be39139dc9536ca3e5f4c75d4a5361a0afe40322f2. 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/QZW9K2360009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x756ec9599abb804111fa5bb11a192e42053c749d40d4ef1e93b6ce88c1b86589. 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/QZNJV2396156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f82045ab520ddf8e34508ba079b49c0140adb62ce5359ef4bf6e62bc1873b4a. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZTPX2252371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24dbde2197fd605381d644b7ebb7eec2abb7423363a09d7a1efaefdb22ec4fb6. 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/US7VG2263609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54fbc880e5983059a4c38d49cde2c04aa655f6f972910a650433dc277764bcac. 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/US7VG2263610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1215217747014db0f69b29dbbdffc46c469029281f7bf44e0b34038e196d2210. 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/US7VG2263611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba6c3c3a38bbc77514d0b2c97adb9244b396fb68958a7f7f067f4f50e65063e3. 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/QZNJW2121385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe803fbfc61e21c4ffaeccf6504944f1d24d5ba6550fc7b0b2ed4cbb97e3b4f67. 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/QZHZ62195828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38afee74489ec544f92bcae2ee5e568d566f2af6afb1431ce687c99a997a5e8c. 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/QZHZ42155960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b27a9751ce17d60dd83c40ad83fdb11e385a9034a49fa8a6da8b1ed4da9c792. 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/QZ5AB2148090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f47f9530ce2ff1eba5a9af16a927cd2294e616fb64ce732337ca92d14be1ed. 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/QZNJW2097638.