thumb|upright=1|Captain Andrew Drake (1684–1743) sandstone gravestone from the Stelton Baptist Church in Edison, New Jersey A gravestone or tombstone is a marker, usually stone, that is placed over a
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 0xc05270efd5c4cd0d28dd4654716222744ae3b656eeb075a6d5409b4ad01416ae. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e4c69c83-4e09-4b6b-a4b9-b5c190aaa64c.json and https://artists.proofprofile.net/proofs/artist/e4c69c83-4e09-4b6b-a4b9-b5c190aaa64c.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 0x5487586e891d45d3c0fd6002689e5efd6de70817f21de2e85ad2553cf308d24f. 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/DEF831032001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb8c0ed1cc173ee6c9e2ee5daecb45ce9ce78ce502a25b8a4a5db71f9b381824. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/DEF831032002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32d341c96b7e938b3b126ae7c2b697ff78bdd4219504c476c51482afae092c83. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/DEF831032003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42114d096552dd313ab7adcd22a5f0b8ebe1a0960a921ae6a655c54c447cfacf. 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/DEF831032004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08b6e446edf9b100b90651b4493e5fe18bccbd15a5738f64b52e019fef9997f1. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/DEF831032005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30b725515a24fbff66d109eee21d19cceb8c91a10c27ca4a39605b982e5135ee. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/DEF831032006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08a5a658c2a9dc704a84a6524aac563c6ad2da7093bdbb9bda2aa8331e6feb1f. 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/DEF831032008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6619b102af9ccc15b4c9af359b1a637e40581d2d2d661e0907c2e3bdc8b71337. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/DEF831032007.
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 0x54a3a30552824dbd3f6ded846c45e6f7584b3a8b90c2f7ce97eac4f8b844bf8c. 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/DEF830622001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cf6e1ea56c3a1639d595fddbb177234bf41487790e91133cbfc09d06559e4a0. 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/DEF830622003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a1c7818931156f934154e9dfc4a6e9832546be3f160be88f283a5b6e12d2650. 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/DEF830622004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8965250e8814153eb9f5ca319fca8023fd7682664e85ec32db6f0e1cdc6d3b9. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEF830622007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x899bd3e7ba8d61481c27eea0ff3736c89b85d1414c6c961e225469627786efb5. 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/DEF830622010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x044fcec2fc3c21dd0cc9a4c692303170cdb7a84362917c08b1d1925aadab4131. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:59:44Z), 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/DEF830622002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33b3bbea103ee27397e27d8032c09903c5a42132f4d1b2b41b19f6ebb2b978f3. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/DEF830622005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x238b77e0cb75b9e471781e24f4154745010fac53fbab2fb9edce0e0a5886e1b2. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/DEF830622006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa636407fc25caf261b3487bfc9d9120a85013d0ebc3a10ff3b3bd08e33b698e2. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/DEF830622008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2469f61419dea75ecc845cbf8f4bd422e6fe1dbb46ecfc77ed61df2c9e7fcb7a. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/DEF830622009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa213db33e4eb2fa31ea1f0675407c42fa05dd9610d899eb287a8a29b443ae6a7. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/DEF830622011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31e6230d1bf4db5a3ed7d5a972286de5a63c1d4c50a501b1ee1421e793e06df8. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEF831092006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f2549ac936b2dbd2435d09d75170b50450a8f4abaebc97f45325d9e444fba62. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/DEF831092002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc14b6ff2381fbf524b056e102f97aee7085ebdd765f309f477aa8e8baffda8f9. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/DEF831092003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf35951cb16a1f4a58c5f1b0199564ccd38cea9c67c2f1f0aaf21acf1621ade65. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DEF831092004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fe6dc6073d31282624e1d30ff84d25139ba054c428ac6266efc30393c6f441d. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/DEF831092005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d2820869fa86bb3dffc6fecfc377dc0e3e0cb40385cc61bff98a328ecb57227. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/DEF831092008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe775b70ab194f1e489e0c49e39482e1ef36533773cf199bbf189b2798e0f064c. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/DEF831092009.