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 0xb818428aaf8ed8ff9a34dba0d320f80bba92b41614c163388de747d4fbdc0333. Chain 2 (Bitcoin): anchored in block 953765 (2026-06-15T08:55:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bd25d9fd-42ff-4f56-aa4d-bd369927efdf.json and https://artists.proofprofile.net/proofs/artist/bd25d9fd-42ff-4f56-aa4d-bd369927efdf.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 0x43473b742be6f6461074f577e55a902970ccfe8c69c742166f267cec8e84df83. 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/DEZC62042787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf72d82f493012de57ad4a64fcc326b0c9ebbd24a587afa32910d1e8e6d9b17c3. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/DEZC62347703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89c8b32c025ddee60362680334fd142d368108f6eecc9a1936f478666c0d5cf0. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/QZPLR2406061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8be6b25be0eb90a3b7a060f8bf95818bc40cafda0e3b94ccd26fbe5e26a2e864. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZWFR2419547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf1123488e67ec163a2e30c1469384228e8e861e1e79086cb5d21f0ae7249a3c. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/QZZ7N2491621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x951f320628a8dcbf0674db35cbafaf7a1d7383fd4a76f93c1529fe59047f7575. Chain 2 (Bitcoin): anchored in block 957772 (2026-07-12T23:31:17Z), 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/QZNWQ2580039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfaceff47eb9a4ecf45111d342689019e696a72adda14f6b974e180aba064c2d. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZNWQ2580040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e334006a3158522e83c256d9fa162eab81fe96441856ceeee7bb0eaaa62b42a. 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/QZNWQ2580042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77d72b2d08cb95cba93dac002e3d61c63551832cfb7fdb7448d5da9b96522c5e. 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/QZNWQ2580043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x235960a1a579ff6026e957f1f3c9710dfa14f8e4f1d01c894f37aba65608762f. 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/QZNWQ2580044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfed708edb05ff847b2b5b67675d14e231e725a7298a5f0600abf805b69805ea0. 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/QZNWQ2580045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a6454cfa6afb679d8e3121fecf2bdc87034a7b7cf0e882e79dd18adaebbcfd1. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZNWQ2580046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5212393011e65ba72276cbe68544208182340f4e48b3611ab146d20aefe254e1. 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/QZES52540671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1013575dea83043be939b8d85d3867d33a457a5e0665707c84d104b6052eb9f. 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/QZNWQ2580047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86dd34b3534f5b19f0c755b66c71b56db8e25315ad9b4ad7ac9bad588d6db19b. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZNWQ2580048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x721cf2b95e19ee34612f1163026ea45da340a0aa16659b50b4fa8f403ac6a683. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QZNWQ2580049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe38247cfaa2d897d2e3597f3cea64df839cb0ed89bf507c69c6ce919498d47ff. 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/QZNWQ2580050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7788474b8ec061338f83bfcd38dab2c87d6c23b554ab9d8d921e8ee98b676e5b. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZZ782506622.