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 0x194e29ffe36e140eba6f6c3bfab1e3f0957e92a347af9c63e26787d751e2ebac. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/76525268-1bc7-4c28-9284-a84ea995cbed.json and https://artists.proofprofile.net/proofs/artist/76525268-1bc7-4c28-9284-a84ea995cbed.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 0xbfb390316bd8d2da1026e969ba334b8f389a1a7fdefe745bdcc8ddf9505044bf. 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/USA4N1200103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddd9ad5fd34260e27cce01f26a4da760581a79e59550d34132a127eb1875765a. 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/USA4N1200185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa12e815f0d97d52f232c57204622bb7e2f83c781a4876f7b79a58ea1c4f5e641. 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/USA4N1200187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa26242543510f60a2568e8ef6f7b0b68f0990d7b3b019fdb59f1503e9d74f623. 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/USA4N1200780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b5e2eaaa38ee5ec67cdde3d207ed77daa49d9d96327aa47674fa87ff7e358ee. 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/USA4N1200993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b6cbf1301f7bb39a9cf8d569dbbe596c023ff4fa4409023136774917f670770. 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/USA4N1200157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6436ff683dde9a8515965abfe1f4ecbd25f0a8add53d23188083ccfc1966422a. 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/USA4N1200467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x884ef71628c70d291b7684999478632ff30bc2365ae469b73996cc333399197d. 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/USA4N1200741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37a715f9ad70b60cee846ae261844a8562c6bcaf1ad7c0e849d6f1e39cfd83d3. 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/USA4N1200972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3855322c598a0f53e02e9e10e8547d9060a76379bbd19de74424ac3bcdf1540. 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/USA4N1200895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2289124a61e9a7a3e0492c1d6979b99fefd3e2ae949c99dc962899a5a82ccd4a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USA4N1200525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7ca5c4758724ea62dea9f57ba84921d95c09be39a31e0212f9319be6fa38aea. 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/USA4N1200429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2526f0aac872fc662cc90439fe815bdbe72b9cc001aa47a210c2c30df7289d4e. 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/USA4N1200523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b7b3549f983ccf011aa0d1b78587d721da78d640551904767a9174aabd13a53. 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/USA4N1200965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51f90bf31c45c5d4faf24a9d99f9745fa901e246bf740c2e3edf2b981dce319a. 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/USA4N1200621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7ceb71c9a99812f0d0ba85aa82778becd56646c59e26ee5fd827b73ddf7da20. 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/USA4N1200599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x047756087f685726a416b3a3fdad443b3b2d19c7af6481f154cc2d664536314a. 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/USA4N1200782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ecceaad3f0b4d1d2fe0ffb15ec664fa55ed6ee761730ddfd94adeb9483207bc. 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/USA4N1200789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13c4e8c42a05b3f9c0f3b91d1660aa6b07a0dfeb8ed7561db8632bd6d8088737. 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/USA4N1200787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc33ca9b8387d02fe301b5e9365e205543f1ac925c787fc948764fd19552b7f5b. 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/USA4N1200788.