"Trampled Under Foot" is a song by the English rock group Led Zeppelin. A funk-influenced piece with John Paul Jones on clavinet, it was included on their 1975 album Physical Graffiti. The song was re
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 0xf6971bb3b37418f21ee4290b95272052d565a8155f0e006391a4a97be62928b6. 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/a0fb930d-c353-4e6e-9ff2-14feb560f537.json and https://artists.proofprofile.net/proofs/artist/a0fb930d-c353-4e6e-9ff2-14feb560f537.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 0xb6d285d7307c41594f1c40a0b8bf4cfc6e941d0c89ab2559fb7776a966d99bf3. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NOXGK1024030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24538f8773201f07722d1e13466128cc89645913ad2e5148661b0ee2bff3ed73. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/USA2B1102303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1718b7548cb9e823cc3e5b2907188567c0ff073033d9cb7b6f91f58c2937d8c. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:51:02Z), 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/USA2B1102305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c19aaa25e83c65d7652ba3a074fafb7d0ac79f9b476b5fc5642f85349315821. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USA2B1102306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38723d0f2b356c13314eb1a8527af58339612f37cf25a31a7c1b91d316a8d904. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T01:57:04Z), 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/USA2B1102311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3c79a6e79d5618c360637e58f00f49343f064b7e64444595a99281824cb4ec6. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T07:11:07Z), 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/QMHWX1300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf76852fd3c4e6f0585acb4e1fe621559efa41a71004baf4bc3deb51d8f0cd9a3. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/QMHWX1300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb3db257da050c14460770d71de6fc3e3e81a35542d5eeee643c97782ad6e91f. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QMHWX1300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b2cd970b8a99a7a64eb4b038c93c0aaa840e3d478de14f3324c6d64f262db53. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QMHWX1300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eb6a557d9907e51791660bdbfdf061d95ff7b34d93f7c640e7fd79d4ad4d314. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QMHWX1300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86c530eb67fd08ffb885c50285936aee6b806b21d64d0f1c62fc4149cfa78b62. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QMHWX1300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53127f6a787e4387e847e2e45d3ce4043a1ff40b24e8448d9c52ad7a446a8a55. Chain 2 (Bitcoin): anchored in block 958462 (2026-07-17T23:17:53Z), 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/QMHWX1300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb3db257da050c14460770d71de6fc3e3e81a35542d5eeee643c97782ad6e91f. Chain 2 (Bitcoin): anchored in block 958706 (2026-07-19T08:50:34Z), 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/QMHWX1300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86c530eb67fd08ffb885c50285936aee6b806b21d64d0f1c62fc4149cfa78b62. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QMHWX1300012.