Used may refer to: Common meanings Used good, goods of any type that have been used before or pre-owned Used to, English auxiliary verb Places Used, Huesca, a village in Huesca, Aragon, Spain Used,
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 0x83a501fc78c61d68c646f8175772227654838b402d416c10dcf196172c70e992. 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/c93e30dc-5d18-42c5-9385-a4ad6f9d9fb1.json and https://artists.proofprofile.net/proofs/artist/c93e30dc-5d18-42c5-9385-a4ad6f9d9fb1.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 0x93549666a4c2b29a6bd5c1107c25244dc897057a58a166b444b477fb63aded1a. 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/UK9AV2200125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x771460629e65376658760f1ca20749b6227db0c1d902bc22856d349f46383431. 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/BEHP42400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b2a741937acbbb9b95440c5a86ceef9a8da58e1ec31f420a1de63034dadc388. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/QMDA72230472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe80b9603097139ba41b09ec0cfda08f7ed4acb35d2766bb01093f1d146e71ca0. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QM6N22288401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa912c4c7d3c3a5da7465424b2537a3fb070f0b1ff87d840a2f533eed4dcaacb. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QMDA72211564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe80b9603097139ba41b09ec0cfda08f7ed4acb35d2766bb01093f1d146e71ca0. 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/QM6N22288401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cd69a5b1909643f52adafd3f6c8397a888e566fdcff75291cb71d73949d7e2e. 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/QMDA62238914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe80b9603097139ba41b09ec0cfda08f7ed4acb35d2766bb01093f1d146e71ca0. 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/QM6N22288401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93549666a4c2b29a6bd5c1107c25244dc897057a58a166b444b477fb63aded1a. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/UK9AV2200125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c35d55408719a154fd30e0e4da289ba90af1547add23e7e4cd50da7788cd3ea. 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/GB8KE1956189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35920e06924a9973d6d68086615bf00ce574c9532b41de5398fd80b1799a43dd. 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/FR96X2149172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e7b14365630b23bb86c9833fd9aedc5cc5ff9121a37a141360c441f6c4ab8c4. 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/GBKPL1811018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86d10de44a45be0cbe26edef92a083bcf882f9cf21bcf4cf25ab3dfce80ede06. 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/NLCK41086469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae20e5917c91f2d71dac3964b86bf6b1c835827b75e2a59221c3dc58916aac8e. 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/QMFMG2351276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20ef59c1dd1a1caa5f4ea31a7bcd9ce2c8c88f0588f0a45ff4ed9eca199b3442. 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/QMBZ92459765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4dc7fc64b6a12cc845b4da334bb1cfd72ebc6c9467c3a7ee89d5a984033f7c5. 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/QMBZ92459761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc186559abd16bf1f575340a18b70f249b43674b9feb4f155ff07bd234b36bc68. 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/QMFMF2386153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8715726b7db63469d3a65bdddf6a5bd23be29cf29d3377cc96eaafd4575a5e85. 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/BE5KW2400529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x213e27893a35b600b6c0c66630b49460d05e12e99c6babd62111ac58d5dea4d4. 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/QMBZ92459776.