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 0x8d9c71dc19bde2d06601212a3a18b98ce573bc5b30eb7e59f63a414fac2addf4. 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/b3b6b0d8-18f8-47cb-afb1-c0266bae10c3.json and https://artists.proofprofile.net/proofs/artist/b3b6b0d8-18f8-47cb-afb1-c0266bae10c3.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 0x1587571ac4be2c3da4f2836435d067c7d5cde473676b3d38bf9558ad1f5942df. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T14:15:53Z), 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/TCACD1544365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86f8549e70f6f699289b7dcc07dd2999a7cc94867a91cc20e4dc2ea313afbc41. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCACM1658159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x505df9fc0348f3d78336fcc1fa556bbe4128dde64b83ceb1e456792dcc0193c6. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/TCACO1667831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd69074baf6744951827debc9d367a70ae30541f6af772b73cff1081534756dd. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/TCACO1667833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2edd9f4a4694e45faa98c89d74836e5a2e5b0b67797aabddd8b9ba9b2ccf749c. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/TCACO1667834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89dc9428688c26723e6e08331c2f543ff20096ad5c2ce6b84198aa5c223cd8c3. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCADT1816724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eb075dd2fddc7d57cdf6b4c5e70619d87a7355c69070f80afb973c216300063. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/TCAEE1946696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6828e69ae9a0f67bbfb2169002e376f0e2af49d452f4add4c44d87111663e0b9. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCAEF1940248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7df3910e021b93a811eeda6c6b18dedab46ef896d258f3e6d3c581af30a61642. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/TCAEF1940259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63b0129f366c1a80820ebe0cc5579f2e0d31c7d1032846d84bd91a21ef15f760. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAEF1940271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0e9a00ead701f2af9d5231da3c8d946236b787d6aae1a1db772d67d101dd9ff. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:04:20Z), 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/TCAEF1940290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f2e5eb15c542d9dbbe5215cf28f53653d3524899dfbcd3aa1c71b1d630c4859. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:22:24Z), 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/QZ8GX1700927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda2991a9b48c02e4376b02d93b53c044c38e55a859496801a3010358144f07a5. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZ8GX1700966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ff30e3c195c178d593248556375cdec444f3eda8779a7a5eabdac708bce0ade. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZ8GX1700999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60c4ca59f86e5701fa15999b4eef0c3b03059cfc4c03ff496d71cfcc43ac0087. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZ8GX1701001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb52d70c1f1fd2e529533509f22dcdfc53c2f4b2dfd2bc558eab13dbe5f593534. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T11:57:44Z), 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/TCAGG2253445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45622657a9087fe4b3d7575a57d1960a7efc0b9614ddcfd09e835af2a2914460. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZTB72298056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4256984a12f440135a866baf47023ed1e1f3aa4728503b5b1de33330435fe761. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T07:41:47Z), 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/QZTB92327094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeded5d4de7fa134940a3510323829d56534f4efb6132667b32520f03a4d1eabc. 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/QZMER2472831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc190c5ec106de483841b0a87cb880a7ba64b7957812b35176b3f43b8348b908b. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZMER2472832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f4a731cfd76f7247ead690b45d5d2defc164e38ee6a611a88866bf882e3a6af. 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/QZMER2472833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90c787dd61c767424d50e9bdf531ccef71e796da5b19491752253a49c36138e7. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZMER2472834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef88fe3bb651da24b3eebf8f6e8ecc19eba8421ee9b831f7436e6820dded89f4. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZMER2472836.