thumb|The Kingdom of Saul, according to the biblical account thumb|300px|David and Saul, by Julius Kronberg, 1885 thumb|upright=1.13|David Plays the Harp for Saul, by Rembrandt van Rijn, c. 1650 thumb
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 0xf46edcab29a51725b9bd884516dade0fe8114b1065bcde1e2ebc9efc76d36963. 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/00f174cc-0b97-44e9-90c0-0fd79262a5dc.json and https://artists.proofprofile.net/proofs/artist/00f174cc-0b97-44e9-90c0-0fd79262a5dc.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 0x49bcde1c69a0e014b5418f2ae44ab2e8fa71d3bac5b59168f57e574acd51ead4. 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/GBUM72204810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb098eeefbbba9cb263250ae71381414a78a33ab6e282997fa5e902b9b9b88aec. 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/GBUM72204822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01f7e2a3fe4b9bdab61a1c89c55c21d4efd04e18199536dbc684f0ee9c8d294a. 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/GBUM72204828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x498c8eeb92fa934991a4497774e0c3a75a7a28b4df1a8fe0ef585be6bf26e867. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T18:10:47Z), 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/GBUM72204829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2499b90c28ca40c16662335cba2b26e8d4160c3d306f997260e02dbeec9b3710. 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/GBUM72204831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf519f09594da74af5cce038b21b5b7dca48f594c2f40eecb6382e698008674f3. 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/GBUM72204834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0577a471909555a4e4482df559db92a2dc0553acb1bd166dc17e37c23712c27. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T16:28:38Z), 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/GBUM72204835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16c722d11be4ec7079e65fdf9dc7b2ae663a1c40baa1a042de656fec2a42e067. 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/GBUM71905545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58e01fc1346a4e1bac759953251e6305ef91a2d7a83ae5984829b08f72d28334. 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/GBUM72003222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b3b80df53e591cf52a528fd3944db9f217e21d43f42c1916ee54c89679f9d09. 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/TCAEA1813641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d30dda5a4e46d2cd3960fdc790ec741305c6cb4d93543f9e3aa547aba75db42. 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/GBUM72003224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5527a1c776ed969712690fbce5d11fe9a3aa4ace2f235f7280643d782747b202. 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/GBUM72003225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x054a67d5c6a156febd745865674842dd9819e6e3ed20d809897217866629a93c. 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/GBUM72003226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb57a9c6b3c753bba745be8eb1e6f75fd33bdb9d6826ed817be709addc4c4466. 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/GBUM72003227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f67e7154020f57a743c320cf9e47506294c749c88ec65025a3e0390ded870e2. 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/GBUM72003228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7af075d195d6a22aed7998c0e437ab97313b3e550615bcae35b578a5c305d6cf. 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/GBUM72003229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbee1af1461b3dcb84f0c6c3db5f96d23bc42922b3b64ca30d46beb146ed4fe1. 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/GBUM72003231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8de0abb4ab8255801a8aaa84ea4a960d6503ca2e782eae4b18a2ee462575be9f. 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/GBUM72003232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25fd7103eaad50ae085f8a7fb97a3921938c9c852a9676fc35c36e0d6a889df1. 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/GBUM72003233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbf664c79ca45161a64f412b67fb7e54dff5321cd63fd40ee9f5e8ec281f929c. 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/GBUM71903428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30bd28ff89ac3984357d72c64a671008736797346479974c2ef492df07fc4398. 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/TCAEA1813643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50b51778bc2ab658c13fbb45069bc3a93541e22791b82ca442e002ca399f82c6. 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/TCAEA1813646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04d566c8da07a6cc1624a2dc3f5e7327b259bcd1f4ea7f14a241c08da46c3eb5. 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/TCAEA1813648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf3591e368e2476ff34a3eec48d5c5c93e75d638061a96f380751213728c98c3. 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/JPV752509764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42f45a1bd4b605b73ab3a5536a0dfdbb378adb404b0f4db34015debb9901d500. 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/GBPVV2404180.