thumb|upright=1.35|This marker indicating sea level is situated between Jerusalem and the Dead Sea. Mean sea level (MSL, often shortened to sea level) is an average surface level of one or more among
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 0x7532e9d6859b7416fad1ba4c18e2d11e63dcfabc239c1c1072702121d144914b. 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/6eb17fc5-51c2-4aee-b250-f024749d6bbd.json and https://artists.proofprofile.net/proofs/artist/6eb17fc5-51c2-4aee-b250-f024749d6bbd.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 0xf644d5b8b5dead8f938ab3f487a3f88f676b3525d4f84fe35132a3fef474e198. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/USPR37780268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d39272e05dbbe83819a59e4e7667092c77ade29dfca3782f01d28eac7eff7d4. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/USPR37780269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8f02b80228a1a953ed0b28299c094dff3e423a79e2ea41dca1d06286c14b9a7. 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/USPR37780270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b5fc40cc82f9f37085c610593d205f6c9bb6a382445d6ed1726152fc72d4257. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/USPR37780271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0008307bf4cf1a3af1bd8362e992da1c5d7428f94e68b11ba724614f1efaad03. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/USPR37887011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10ecc106ef43cfc8bc6449d965fb487918a862225cc8238d52ad165dd9d89802. 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/USPR37887014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7f94582c6b823cfdb4f285bd4c9e2df06f8e78e71536eeec1b392959aa1a423. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/USPR37887015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbf806d274fbff5d5afc4bbb4f70d7a1229e93b4ae5f6884464ae7afddee9a1e. 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/USPR37887016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b021a42cec3afe23b21d0ceebb0878250337a1491ea69f009ef94ae4450045c. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USPR37887018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b20e5181cd987bd8a005b8561a16b02ad1d57bce284ab546e17a4724aad39fe. 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/USPR37986810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1de792251cd16a11dda7a81f5a58546da81a010aba6ed44f5d4d908e0d8940a. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/USPR37986814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52b15a82e3f44fee2e6dcc5d2084b66e77b4da94ee119c05ca4f06b0f29892b1. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/USPR37787056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf365adbe95e66df94d94d2cdef560111ab4d4a3320907dc6d3770d357da955c3. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/USPR37787057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8ed8810eb17751cd59bc73dc0809781e94f4b7c3b1432eca8b56a5bdb52f502. 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/USPR37787060.
Live at the Ivanhoe Theater, Chicago, 1977 - FM Radio Broadcast
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fc07a20060b29bec71371e6c0635d8f026d0cd83aa4eb728bbe25bc82a779a4. 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/TWA531657204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c9dc516aedf4e64f0468904a44fd2735a096f456d1ccf4d8e5d5b23449188d4. 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/TWA531657207.