Calcium is a chemical element; it has symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. Its physical an
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 0xce566caa3b3470a7219d2e0d0e0997c210e7ab955de9d78c6e766bdaccb8089a. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8e59d321-bc2c-467a-84a0-6bc3f5ff6439.json and https://artists.proofprofile.net/proofs/artist/8e59d321-bc2c-467a-84a0-6bc3f5ff6439.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 0x5ac022e9c384854891be86e40868a88a0b04f1968f9b0b517ca46c45ca2305dc. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/QM24S1841188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0c66a34cb5d0f17fe6593427639519f7c6b274d15c173ad7ebd085984b00e2b. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/GB7YL1997401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d7747f7df7c0adc0dd8ff1347e4da40b8d8d1e9cc3d2633ca257d38ff6b3af1. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GB7YL1997402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd70c36f986455997960ad85630fa5c0face5cabac2b7c8d2b17961b8d87571d. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/GB7YL1997404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b2235d23b81e18e912cfd3048083f06588d5ae74965a9aeb57c27bc392990e5. 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/QM24S1913980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ee88d0490dd3226026b803dadb465ca20eed01b9735794310817cee97befac7. 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/GB7YL1941301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20545d870dd68644880860658c5184c579a9855189c0235b584cc039de664568. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/CA5KR2035317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4de7b2934375e1c4fc565ec4d2e3f83e8b22945d1cc8a714f567c1e480a83814. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QM24S2009226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b8163d2140583dd4981b686c78278669188ea407765ec7b666160a5fe36e28d. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZ5FN2114046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63a5f8c58fa624c967343d3d14776da17391474a46a73da9ed30af215f71d925. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/CA5KR2155172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3582c9de232000dd8fb02954f4434fed3e1e3915d467df19902a2dbc6e97235. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/CA5KR2155173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x877f0f6456b4f4df15fda13803b81ad9ebd0c2cfaddc6c82a49ec4b3e2d15acf. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/CA5KR2155175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf31ffd9807c4efcfcc3adaded91837667d46c53564bcad749adc354ae6af11ad. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/GB7YL2100073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeff9c4ed9adc95fa445e2deb425ce1b1f91afd0a9ed6920da8f1757a78108a3. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/GB7YL2100097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d49218d8de686d25cb1f0cbeaf14999a9e76fcb50520cfdeb80c9799ad8dedb. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/CA5KR0005515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd68ed53bf727970b2b8b1c7a39bd0f73c213550806b15260289e93a7dddcecc. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/CA5KR2208117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3012e03b876229d46ece3d2e63e9a97c50cdb6ca2602fbf498a2e59216ace29d. 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/CA5KR2208118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3925860c5c0875af0f37ffade32621b3225a92f0c30262ccad917e20742c424f. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/CA5KR2328642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2d9adc0c91b537efd5df1a95e9ef45b4eabeb7f3a04514030440173e1b68bbd. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/CA5KR2344489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbda8faba784cde905e53e355912077b95621f0a480cee6fbc1fc0a7d3dce8d4. Chain 2 (Bitcoin): anchored in block 958462 (2026-07-17T23:17:53Z), 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/CA5KR2349670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x753af88957411f3fa0baed33fef91f7ca77a2ab67ecb1c29ec2450c9d85e4a63. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/CA5KR2363489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x910d5c545df68c80598d0c253a0d70a283a4cf8f47ecce43381da70ccf48ada8. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CA5KR2368316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x980c9a7dbb579741db71018c63bc6e7d3b507bd83240f9cb69aff86f6deb802e. Chain 2 (Bitcoin): anchored in block 957884 (2026-07-13T16:55:06Z), 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/CA5KR2368318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8301293b401809be6b3ef2b871f00246642c1e7925b0dd4dd45942335030aaf6. 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/CA5KR2384810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x407ede0bef5634342b921f2b676fb0cf8479c88a599a706b416a3d25daa2d821. 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/CA5KR2384812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc50bb2656e164326bf53454fc26e2a44776a627da9e3983deba34a2e62742271. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/GB8KE1856397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xace345d0544aed562e7856ca0558f9ad9dfe014a40e60c6e1dfb2c37edcd4f89. 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/QZHCR1900050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd47495c8d355083660de474b3191df1550fe5a5aea35b141ada87d06195f88c5. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CA5KR2294031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16edcc5d5c96cb16bb1f46c1addfa8b0fbcf5d64d9654ad4c9aecf4edb33ba46. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QM24S2202380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a166b444219e2ef0602a2ce720592b7c475cc70f3211863162f86618a5b2761. 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/QZHCR1900043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd47495c8d355083660de474b3191df1550fe5a5aea35b141ada87d06195f88c5. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/CA5KR2294031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x379a7588508e4e0f994a8dd84ea3409fe5361bb80a82d9dc24ccce268cf6edb3. 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/CA5KR2531036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ad220c963b213441dc9a2f9798a1c21bbe82f82bf91afc6c4cedc6d0c4e2245. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:03:01Z), 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/QZMHL2066327.