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 0x143cae0c16398551b99f3e88f91bd8f8c9c2f4b7b6d8045e4e36f4820b8cf6c8. 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/7f67fd75-00b5-4397-9a3e-4995ac740f07.json and https://artists.proofprofile.net/proofs/artist/7f67fd75-00b5-4397-9a3e-4995ac740f07.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 0x8e3ebb84bc0fc7fd6fc0351148451fcb47e1e05616da602500f3db1dcc91dfd1. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZHN52326920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x008d8d46d58b73150949e29fd0192c2c8b8ab55051dae5da62159f03aa1aa07f. 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/QZHN52326921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa608bf0be8545246638e8d8a6234dd8072c02642ef5b08620181951342c0cac4. 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/QZHN52326922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf00ad5a30e01fe0769b4247b4f798a9e2dd5f8f4c2c48041eca7e33b887b86e8. 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/QZHN52326923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14e5a7fba9b5de7d94cdcc7dabb7f4f0e4846bf2d475c0b05ce867ec045a6589. 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/QZHN52326924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7f37dff6445bd0712a164372bf17c8a838edeb3de933c7930ef893ecbac1d08. 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/QZHN52326925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff812dbfbffee1dd43221bfb9bae958794d75efc3c396019465fa8041575399e. 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/QZHN52326926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc515db10829f5c1e18d80e2c06928bf8d93eb2343655d8e2e3109e3f511849da. 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/QZHN52326927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6d2735b295d9b20ab2da66860a8359ab4e748c708ef9b621bc37ac404e5f488. 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/QZHN52326928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa29e92e3b3ae7f78d171ba424795941740631ceaf631e7545ece7fa61d5b6685. 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/QZHN52326929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedad3a9b6de57288caa5744179e8e5a54c3ed229bbc13ff83492a62b3ca3701b. 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/QZHN52326930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf15328acdbfbd3ac0c685c0f91783dc6f477118e6b04ab1ef04a08ba03513e5. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZHN52326931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb42281681c1323d67035d1edaba2862d2f25be75e2009d80a787132d84c651d. 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/QZHN52326932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f72333934f9d9f19a96d9eac2401966f611ac81afb67d7e930d7f04d975e028. 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/QZHN52326933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f96357bda8e36782dc9e75c1e06d54d2c8fe424d1cde5ef970b1c5f92a07850. 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/QZHN52326934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbec008ce6d2f9b7975c6a7e42feedf85d496529f660e97c92add762a9a5ff451. 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/QZPLS2396341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdec985d65b16856529b77ea039cff7599c5ed4dd0226d8a76f509af6c5f20275. 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/QZES92347543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d5c319fc495c54988de0d145fb200a7dd3571d8c4951614bdbbddc2130ae73c. 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/QZNWR2060786.