thumb|Attic , , Louvre In the typology of ancient Greek pottery, the (plural , known in ancient times as a ) is a mixing bowl or cauldron. means , but in modern typology is used for the same shape 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 0xa1cdd87d0f2292d807d274eb5d84cf3a6953b583a4de63873aec995c84da9771. 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/afbf8b8c-db4f-4f9a-b30a-f1d2218f9406.json and https://artists.proofprofile.net/proofs/artist/afbf8b8c-db4f-4f9a-b30a-f1d2218f9406.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 0xbe6dc780a048d65379a6fbae822fd5bbc22233968231f7266d231677c2982133. 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/FR9EI2200420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2818a902237faea2f8810b368766591dbd728f0e1d2cd9b67106c1190c97f08. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/FR9W12355525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93eeb9ed78b983dae678a3fff341ab58e2bc4710811e591c95267798c849bb15. 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/FR9W12330365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x839c13a74b49c331476b4ab6292e4768665062892ee5be90fb726159be4d6a92. 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/FR7X62400020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2818a902237faea2f8810b368766591dbd728f0e1d2cd9b67106c1190c97f08. 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/FR9W12355525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e000b93959eea0276d9f41c997a878c91ba6c6f061bc4bb91125622b0a5ad08. 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/FR9W12415086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ae290bb5d2bb0f67022c917d8d0c71a1bb36f0d4d4654918587df856fe3513d. 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/FRUM72200450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ae290bb5d2bb0f67022c917d8d0c71a1bb36f0d4d4654918587df856fe3513d. 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/FRUM72200450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x320730d17142e0d230146059be8c0369661cb071d209879a5042191abc95105d. 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/FR9EI2200570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8db408226f29e7efc0361e382e4311e6c6f9d9eef8f0a5520839876242a8b58c. 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/FR9W12408439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc35c6a3c00c382a83587ca40dfcb586c6aa1b0ff9b423c0685ffdcb55ecf74f5. 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/FR9EI2100240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2cef581d17768a4f2c94b49a44e8cbce71ca8073ae2d50037ad4a656b6af3b5. 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/FR9W12206434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e000b93959eea0276d9f41c997a878c91ba6c6f061bc4bb91125622b0a5ad08. 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/FR9W12415086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfba03e949a07ee69608f41874149f1c77e23964430626667be36fefc04de75ba. 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/FR9W12204926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19fc5f8406fe53bb4ab5091bfb213ffc8b96f968f6f85cf73bd9365505122185. 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/FR9W12330366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19fc5f8406fe53bb4ab5091bfb213ffc8b96f968f6f85cf73bd9365505122185. 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/FR9W12330366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ecaa14fb78e057adaf127a7f8f1a2b1290a42bab9856d15b9a203e88c383c3c. 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/GBLFP1721847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fd5a32ff2040ba0d745ce6401c2b2cff1fbff61ac6e824d669c96f276de264d. 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/FR9EI1900220.