Spada is the Italian word for sword and a surname of Italian origin. It may refer to: People Bernardino Spada (1594–1661), Italian Roman Catholic cardinal; patron of the arts Constanza Spada, stage
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 0x1441964ef7f2650eb39d5b0057dc7df15672d613826b42008e4acd39cd15686f. 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/836646e7-5dc5-4206-89ba-5ce0e89634ee.json and https://artists.proofprofile.net/proofs/artist/836646e7-5dc5-4206-89ba-5ce0e89634ee.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 0xa3dd1be17833c6b8f99167d8e47ddc371cd10c325c52b58ce9126678a2f8762d. 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/GBJAJ2200419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa20e01fa1470521a6ccba51d3fd52cd45d0bf2f00a28157ec0fc45e9bc33931. 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/GBLV62316089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc4cc4d280c3ee53f08d73ae259ad9c62f32eb2783c4b9d9e76fae628e19e853. 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/GBKQU2311004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6574079ec3ea8a6dfca39157927c92abc6c38f809f91c5a38f92bdfe181408ab. 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/ITIO32400128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cf5bdc304a9b7882409bd66966fe5e88c8009b5de187baa8092bd611013efdd. 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/DEBE72400416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd34ad9e8c380a0bd9a52b70e7c69cea9da277bb99cf958392c590e102806ccb8. 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/GB6LY1601302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3781bad0c1864b0a2b9af01b63c0181ffc9d10cce094200155944da70ec75147. 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/GBLV62308793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51a8240c76e15552cc4657be316bc22825a04aa7da3663d873cfc374c2c0785b. 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/NLEW22300036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb558bac450c5d0e09d21240dc49d9a9d491678447a4a602ba1c498074dcb45f1. 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/NLEW22300037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd5c9a41bf5e812b366171676e999d94a326fa8dd6ce59d63d88edcfe884f658. 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/DEL022330007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4896c0ae4638809f8e7a3f3bea111aa1c81285433fc66941047ecfd9edbbb0fa. 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/DEL022330004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41a8d77cb49faf547eba448e1e362f02bad40ed543a31ed41ec3ff55f7281b7c. 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/GBLV62214161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24c7b628833539fd5024e2fb29ff9ca71f37144326f5897908139df59ecc0f27. 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/QZFPL2100241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa449a4c64070e05244f5ab501a893156a52bee9b51b4d7fb28256474503f7125. 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/GBKQU2265162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89ea58a48a256baedced4d3de896d009fbb2b82d9eb40a8f7bcfaaa74a587af3. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/GBEWA2202940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01e9dd0afea114e808a459da6c4824592ff1316749576bae86893246bf14fec4. 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/GBEWA2202941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97e8ec53d8e83242ac66fb8588a15a9140b88dd567abe86d61cfead1158a37c6. 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/NLF712200093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf17665f15bc9c2dbfddeb32abbd2f6911a9765035dd0dad8cb59957ea2987192. 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/GBJAJ2101800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e6b8d5ca41d339be30013bf8bf0d7338ffabe0c1481eb0ec52f05d95b25998e. 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/CYA112001009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80ee31a5dbedf40630e3f86d35a33b436d4b019db68fe16719543c93c34f5dcd. 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/NLF712209719.