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 0x5ed0d1cec6c8f869c088abed691e53a95c6ce7da84b43f4609706a939efe07ca. 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/fb18af38-8dc4-4578-843e-57dcd479d971.json and https://artists.proofprofile.net/proofs/artist/fb18af38-8dc4-4578-843e-57dcd479d971.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 0x5b8582d35fbbb31216f4c7be25f590a2d0f999e4792564f594d16218a66d829f. 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/QZFYW1943950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78645fa087af6be93d476696aef095f2182733d9f5972fdd4fb820ead5896275. 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/QZFYW1943951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafb2feb269ac1f5c509e01ef20ddd563985a850f49612b267057e93d50cb7f9f. 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/QZFYW1943952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87b6faa01904e5991287fe4e26a2cce2396461bfdf18e0e05a1ee9cef00a638c. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZFYW1943953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07a7b342466df4413f845371b4c47d0810a9c8aca5d30431f9edee89b28c869c. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZFYW1943954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33ca458c9160cfe9c04a4fb7c1fe8743aa1862ea32764e0278e6375a19d008e0. 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/QZFYW1943955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x367fae5a201a1f559fe7675009016a893cfc7b53e1273a8f4952164ed4bbc7b1. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZFYW1943956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9725d704c5428cb70b8ff63db163cc120bde5ba7a9046174eafb365c6494d23e. 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/QZFYW1943957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cef2d587c5213e9885f0c3dc13a3317e48e7fd8f051aa4f61ce320f48f3b71b. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZFYW1943958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2e6c3dff39f2ae1d8908ebd8ae18125c6fa9b13e751c433bfacc3504226d839. 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/QZFYW1943959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cd58b2415dcf4b652b74d628ded1d97767ca9eec034fc0da24747ee2877f7f3. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QZFYW1943960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56efdce3b70e5430848c0b47e89a63115a259f2debd9b1a8f55c13e0f0558722. 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/QZ8LD1793933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9606fc4ab7c994b00fb8c8d6e6faec8320f4f1e21ccd34029746117b5914cef0. 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/QZ8LD1793934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x845ab8fc009c660acc7ffeba08feb548dd39c3732b0dd5c7d6dc80400785fc69. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZ8LD1793936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9c178fb4236cd7e70d9d19ec2ded692572a60e541d947e2efc4d61e74e9540c. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZ8LD1793937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeaa84114adcdf5fe8e02f7957087667aea3cda8bfc8724034c9b6f757c95fbc. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZ8LD1793938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf781f37d514f79ff16aa7927f7ed393866631c5a34e8e8ea4cbb2d84a8c5776e. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZ8LD1793939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10c36965e483260ff3449971bcb71288e72e8aa9d643f64488e504c139936121. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZNWT2261019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19274696585e939dc443010080d61d554bf6f0d977ad367331f25568a49d61c6. 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/QZHNB2211388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bef872c9c6f576b366278d7ca8c8e579338f6b34aefb45ee53f2a9f72689c62. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZES91977388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb37e05ccf29c3c2749d6745ea647e85e2747b6edb4d87d6f9a2bef7b000f6465. 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/QZARB1823034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x081ccd29d68f26d69361ce3b6024f215f1235f2cdb2c89384c8d4b0dce184d5a. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/QZ4JJ1690628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36265dece7e608604f9e19957f4350237f3a06888de5bac8a2a1bcd18e588337. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/UST8K1617120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ca3e520022e754a970f69a60955558f696c3d17ac424995a7faddc269bd81fd. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/UST8K1607988.