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 0x3a43101ad6ae42e05b78a4f67ac14b3de264ef3df21447c9d4238adeb074d5a6. 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/8c7e42f6-d093-4311-8370-05509fa428a8.json and https://artists.proofprofile.net/proofs/artist/8c7e42f6-d093-4311-8370-05509fa428a8.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 0x59e46fffabccb869e4a07c5bdea8fb0f6ad7b28dedfc60193ccb4183c222cdad. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/QZW9L2227225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeab3ab9e569186bc720bec09b2f108475ce64443d52372d72679366a907f4e52. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/QZW9L2227229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x932b27b10b7f9851ce578eb72cccc8c91c12084759cfbcb6a07228b396f30d85. 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/QZNJV2363743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x394fee734f27187e82be5b2e244e80be262c979631b90ea3dca9cc78424dbb3a. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZNJV2363744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fae3459d3a94833316350bcd34c0adbd2c7467ddb8bafb3cd8623a15a810064. 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/QZNJV2363745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31cc43777a0e5c2a848310087ce8543993a1f95d90bb46fe35620ffd07baf411. 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/QZNJV2363746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x744ec0fdf91059581d627e5955b80ac6e669958843a62722a928ada498352da2. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZNJV2363747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3788561d834107d6187df2bd3877c9d392e4a0637c187ff5adf97ce027d5ad12. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZNJV2363748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef6cf89d4cca0b9d526fb08d95b665e2d47813f3d79513dbee6edfd705a5cb12. 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/QZNJV2363749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b44ce749d409a3edb681da521f5e0c3e66937f257035115b7132c4e534c5e1b. 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/QZNJV2363750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefa2ead1e3e917c0856db1408b26fc8bb9bb8f0451ff1b21bce619843e561ce9. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/QZNJV2363751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x945f5fc9d5d93d0ac3bf0c388dab66e7a7d73bb8f9d1364cbae3e14aeec07871. 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/QZNJV2363752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5253a6b09e6b131bc9b1ae5ff12bea18b54c2c3d86542e29aea18663c1c13236. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZNJV2363753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e91cbc45d604336db2a4da81f08b1c4123c95bc3406ee332e1b862a0837eab4. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZW9L2481477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x398ccaf5150a38d64b84b71aed3af2de6f6effd00db2abbc363f2cfc435ce900. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZW9L2481482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4035a36a55b6d50ca4143b463494f35c0e52eea2c3c650eba6d1b1fa4cbc6f00. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZW9L2481484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x626a14e6c4aa3aa37529e626d85f8de2cf6265921bfd203f96a703567d2e7d1d. 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/QZW9L2481485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9bac6bc2d937df206cfcef765d9354a439432ea02b4f883a571b68f0e005210. 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/QZW9L2481487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cb4117b8daf5c6c3e0e6c9e2dc374e4f7aa6f1761d76f7162bd08983a153169. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T13:22:35Z), 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/QZW9L2481494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4f79caf2ddf86e9fa3f6b444e824e97fe0d016a78d4889ee4de33ae5befab2f. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/GXD7G2275930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf7619cccfd40d6119e1948b5b6e823d477e40732d2acdb76d6663fbbcd5f520. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/SE6SA2455258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x679e47b69628bb84bacf44927db6d96bd3d7ae8318f3043e15966899fc7a7809. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/GXD7G2287543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c907ed5a8e3605068dce08bbd2f466a041d2335791d0094beeb3bd441c52405. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/QZTB62576054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96dc40034b38c1ec26df6a6a07b9949c2cf6bf8bd48b8a34bf6e115fd0b652a2. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QZNJX2502752.