Dro or DRO may refer to: Places Dro, Trentino, Italy, a commune Drouin railway station, Victoria, Australia Durango-La Plata County Airport, Colorado, United States (IATA code: DRO) San Leandro,
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 0x9b63f64a116cccd7d1edf1803889bcd58c5ffcbefeed1178f65faaec85184a69. Chain 2 (Bitcoin): anchored in block 954035 (2026-06-17T02:39:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3d4b3f92-5f23-4a53-a03e-04db343abb0e.json and https://artists.proofprofile.net/proofs/artist/3d4b3f92-5f23-4a53-a03e-04db343abb0e.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 0xaf8f100852e8ca724874d6cdd7c5fbf2dacf0d4c756afc29ec015f32232ff79b. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/BXD3Q2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7982fd114457f3761c71a98c8e220a902413ad710842dbcbcb167a4e8e9b1305. 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/BXD3Q2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc0b7d55d8fa0893c284680c6a5d71a0829a812b4f67a8ad442a2dffccb8cf24. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/BXD3Q2000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a0cb2b50a0b51d4eecf35d7188515852847cbe618ad85488c8449f607289d98. 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/BXD3Q2000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2a2d3719d4a9029f06f60950c5568f3dd077fe63152c07206e1c20b977c46e2. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/BXD3Q2000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdadb5733526f6a4eccaa3221022e687096f9677885c38b1fb40187dd693cadb4. 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/BXD3Q2000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7184be8a10e595717b9322dc488451e72b04b93572962b82260590219b4126df. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/BXD3Q2000009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x767ed58c86feebb4b32b3b67f0ead38267344999f30d6bdb6870be92cfef1eab. 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/BCIDA2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f4ce6efe7deeaf46255b555ddd702b6a5b9aa2e192ccd7189680823b2ce315b. 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/QZHZ32086345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2ae11fd160238d28beada3079cadd53eed0747512c244d1f7f571b72a699abd. 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/QZHZ32086346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a3553f8a02590192dbf6185fd29ca6e55ddaca87fc46d9179f3bd6bed956439. 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/QZHZ32086347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaac022cb5d94dc33d6a7c5cc447081ca9385616e6533792516cba749e9b46e43. 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/QZHZ32086348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99dc3de7c15092d8f30352d6dfbeb04639dacdfc54095672d7dd3abb8603f0d1. 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/QZHZ32086349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f53c7664df28bac2a5c0e77c0c57918af8b52abe8093b59a37b79fea86606be. 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/QZHZ32086350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7831f4dcddfc537d92b6632595739420c0f585a4da5483e2503a1c690bbdbfb1. 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/QZHZ32086351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b820460a33d1c7b9204ca1a20245b8541c5fa0f164674c946e5c5f0f6c1addf. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZNJY2157439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1d02fa5dfaae61123593fd9946b22f6c47f71d1eceeebc7c5f5f07284871185. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZGLS1963285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f22c50473d0e1affefcf55bfba9875500d52c802f411408fd0810253b3a4f7a. 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/QZMZ92087433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe858575b752e5f3a1d3a14a76d23630ba9aa6cadaed10c21fbf9234f079cd2bb. 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/QZ5AB2055905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46126b383e864562e4cb01cf99ed8cb8c6b056e0f8baf08f5bf7aa2dc13e25f0. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/BXWRT1700014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd31e0876724862d966e60700f96205e06b089cb7d672d31ff7374aaad27e820e. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/BXWRT1700023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4951b998e556e6275cc69e7d8b923b892327233230e5394ecefd701474bc68de. 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/BXWRT1700024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72843aa9e487142c798f790589fb3593aa13618be503baa4cd4c0607a5adc157. 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/QZ5AB2014739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3bd7b2781d7c44b765cda680586774355f8e9b5b68c7cbeffab74e55fb88439. 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/BXKDN2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb70cf1ff2dcffd66d1ecb0ae4031604b6711d221b912b992dbfa4e363b80e5e. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/BXKDN2300007.