thumb|Fee slips for a university college. A fee is the price one pays as remuneration for rights or services. Fees usually allow for overhead, wages, costs, and markup. Traditionally, professionals
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 0xb2c04d3e12830b39f5c6090782413475da228fc2f48484242e5090c6d713018d. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4729baa3-ce14-498e-8938-fc4991568ac2.json and https://artists.proofprofile.net/proofs/artist/4729baa3-ce14-498e-8938-fc4991568ac2.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 0xe89d1f8fcbc3a10fb7ca8d05fd49fae4594580beb034ef1fba4a9943c32e8bcc. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/USM2C0701402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10d24ccaaf3ea0fbb0c4c095c44a918f2496b74d6c70a85bfe5f25d1b93c235d. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/USM2C0701403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12c448f96e4bd9442706803ef2973e92b4897b8cbadbb5e1da517d7232193da2. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USM2C0701405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99c188fb66c96c374184fe2a05beab089ad659989dc1452a704d41604d496dd2. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/USM2C0901302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae75d25c77ffe6dba66c52be559f37b77db761b0757f38c437c1b562dde92c77. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-17T02:28:07Z), 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/USM2C0901304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd72d9d38bd78d02d02b8a11c1f96b25f2b1b94622c93debed5f1959c43a24e2c. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/USM2C0901306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2efcb3f52a0be0b1e2526aae78878d2958a589de5985bd959d5d62968d56ab4. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/USM2C0901307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2801dacd7608beeb202377d6abeb07d07a6dd3e7783044b95390d871e97c2c8. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/USM2C0901308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01b01e6ff0a9e9cb7c907189f4c266c4407ebd42d927f3c9b61b1ca6672b9efa. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/USM2C0901310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99c188fb66c96c374184fe2a05beab089ad659989dc1452a704d41604d496dd2. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/USM2C0901302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae75d25c77ffe6dba66c52be559f37b77db761b0757f38c437c1b562dde92c77. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/USM2C0901304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd72d9d38bd78d02d02b8a11c1f96b25f2b1b94622c93debed5f1959c43a24e2c. 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/USM2C0901306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01b01e6ff0a9e9cb7c907189f4c266c4407ebd42d927f3c9b61b1ca6672b9efa. 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/USM2C0901310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x552245fc774e9340664551b333de0fe98512d8932d1d174badd3941bb97066a8. 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/USSP31000058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68ef03c2dffedc57cdbed4afd2b265fa75a868181293f6c97e17b0f18d854171. 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/USSP30765796.
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