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 0x7af30aa46986e740fde417fcbe3284a34a17da7aebe1cd0ef3c768423342efb4. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4c2c0ac9-cff7-48b5-a82e-eff71657be7a.json and https://artists.proofprofile.net/proofs/artist/4c2c0ac9-cff7-48b5-a82e-eff71657be7a.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 0xe8f1e7102bcdc5bfd986ba05a2f924dda657f17ab142b5a8a4f75d76438b127f. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/TCABW1481961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eaee7ceffb25782bfe98e1baa94241e7fdac87d1ae30d86df7327f3862498f1. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/TCABW1481966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfde967de1fc9c8e5326276ddeae2133a5a229155da4078c02461473215a4d99f. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T07:10:22Z), 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/TCABW1481967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2635894adb4c23a3b129cb5f7f78abac19da3663d181085ee4eec0f4f3096b4d. 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/US4NA1500511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a1cd39d72c29220b1e738fe1e1ab1454ecf27d65e9557dc3489d20f25ee4cce. 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/US4NA1500514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf21657f388230e95625fdbcb2014f99385b66c9a73dfebe50691a7e690e7330. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QMPKX1706632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x275a0e2d5aee4f42f77ed11ccb73be05aeadd8be3a95388a2ddd9ed813425dc2. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QMPKX1706635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6fe0752a36c24978037914ff1d69b7258b0c40eb98c3622b7c35c61f464120e. 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/QMPKX1706637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc07016c824d293bfadebfee5bccd135f899a8284ca4aa9d466520105ca9d5a9a. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T21:15:41Z), 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/QMPKX1706639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb25b76677e6f6b1663dea6ea1789c235e51ad3f46f67a8100fc4e3c3f8cc6729. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/QMPKX1706640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa929bb9b9ec09ec2b96e6a2f08d8ef12e7107568603531fbce28f12664f71a4. 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/USDHM1906533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20fdc4077ed77a89a2d2218344ed9f038179843a31c30c071fc361620034bf1b. 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/USDHM1906534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28eaa521b9385afbbc05a51d5b70d55ccb2f64a1e3c8cb0376519e437fc064e4. 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/USDHM1906542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fc4395f5b5aca9ba66a4b9728acec2958e2dc620da039b146db877694a61739. 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/QZDA62095786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x464046377830cc943f47dd5f1e04d71ada36abcf6873112b53cf3fa6cd40af5d. 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/QZDA62095787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x946ef907a6d7061a5b6a0162830ba620ea00e4ee7924fa9dff7b66e4cc18ac07. 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/QZDA62095789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbe4f8e3aeb3747bc086e1d753f5efc6411c44402d43a5561e9288522b61d905. 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/QZDA62095792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7603bc35ebd1071eddfc399dff74827a44587ce2cde342ab8292a47cc05e741. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZDA62095800.