alt=A 17th century painting of various objects, the most prominent of which is a human skull.|thumb|The human skull is used universally as a symbol of death.thumb|alt=Three objects on a slab |A flower
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34994ffa23a503bba7ea73831c0ebccfe3c0850da4a0468e8db64fff1a85adb7. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8dcff796-96e8-4f4d-a7cc-962c533d8d83.json and https://artists.proofprofile.net/proofs/artist/8dcff796-96e8-4f4d-a7cc-962c533d8d83.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5629a3b5be29d5db2d32924efd7ab6eea9a8a7f4c892ee24bdc1e88192852c3. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/US58L1144704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0032cce42bd9eabea929237532d888e62ca14331d40f2133cfc0282cd30499c4. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/US58L1144705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7483cb6779c24bc410ee4bc4c27fd53f6c95301ffa65869f46f00dbad94ee70d. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/US58L1144706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4760b1782f5c8f7fb8689255c70659447ab2fc253d5167e14f2e04365676bc77. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/US58L1144708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77324832190d27ef9e0418a2165c4415629ee2afbd8c5e6ae6d93c005b1f72f7. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/US58L1144709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b21eaf2d62abbb7b58b94f978de250e2e1b7b34d75eaa012ff7ba319d02d983. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T02:25:29Z), 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/US58L1144710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ad30e91f4767d7233328888984af7ec147b2db2728a54a01f88645273b1ae8c. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/US58L1458302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf78cd7c3e1a56c3ac646818fa8f980ce9c8a23160be362c5608cf45abbe76744. 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/US58L1458303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78852e01a960c3a87ec7f864c1548311dc65fdc162b176b55eb56029c49a7e0d. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/US58L1458305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e0113cd0c4496dc5ea563b2ab974d3a2b093fcc9e7ea8274edb6fa2ae254728. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/US58L1458308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84ebd34f87764c045211a553aaeb7485aae1f5f4cf33658d9f462587e53385a5. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QM4WV1500105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7875e903f170f05068b634d74ca5af9aac0ce9931dd87994eb1e0c45bc2ba8f. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T19:10:26Z), 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/QM4WV1500107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x816364ec4fe15a17c4d8699de54bcaeab5b6ae9c058cf74bc2272a00149f6fdb. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T05:15:06Z), 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/QM4WV1500108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87144a0caf598f663b14661f44ec1827f7f0606de540b7b8e0df6a1ecc50a15f. 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/QM4WV1500109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ba42a4a77f2eba398dd47d763ac2682108e001e95fa178d548625eb2536b05a. 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/US58L2390601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14c17161cba4aa386f62fee03b6f9d9895ae691bbe435cb082e389f0224b0e0a. 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/US58L2390602.