Prospective refers to an event that is likely or expected to happen in the future. For example, a prospective student is someone who is considering attending a school. A prospective cohort study is 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 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 0x94e0c6dcfe73d87704a5184dcf1a66b5d4177c0412ace5e30478120c94bea56b. 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/9111a6eb-a8e7-46ce-9a97-7f2b28f4b129.json and https://artists.proofprofile.net/proofs/artist/9111a6eb-a8e7-46ce-9a97-7f2b28f4b129.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 0xa60158e1480dc06ea970f4cd2c1574a9dd0d86299b32b2343aa585b676756631. 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/FRX762371474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17dcaf1bd5053573be968895e137e9e0a19d89d4f7872b3bf6526e264dd8d7ed. 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/FRX762385396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16b5ac3bfafdee048b53cd8a09241051585d259a4b715be4c87a4dff5b275275. 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/FRX762385397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe8295c048929de33d68d5ab5ff2792800821d68c6fea3afba2c612d70045cc2. 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/FRX762385399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c0ea6bded04404fa7dbced8e3af4148c5884a210b1313b38e29c0b913d75452. 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/FRX762385400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc2e889b1d7da69c4928ddbc604432541ab553f09f14ec5f4072eaa9f5e112a0. 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/DEA451904620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93cffa286816779db8ae0137aea4588d07800d3273c76c938e85910352937fb3. 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/GBSMU2982600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75ae4629c6d4aea09dcefa50147f7243088841a4aaaefec6b5cbf80ad277acb4. 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/FR10S2519467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa14328be63fa67e2bf89f213834b518e94e32ae227b83ecab6b5ab3ee1882de7. 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/DGA0R2459184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3233549ebf78f222596895fb1512aa5ca8eb22cbef5a92222b26f25f7a5ddc0. 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/DGA0L2458847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa14328be63fa67e2bf89f213834b518e94e32ae227b83ecab6b5ab3ee1882de7. 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/DGA0R2459184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3233549ebf78f222596895fb1512aa5ca8eb22cbef5a92222b26f25f7a5ddc0. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DGA0L2458847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3233549ebf78f222596895fb1512aa5ca8eb22cbef5a92222b26f25f7a5ddc0. 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/DGA0L2458847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa60158e1480dc06ea970f4cd2c1574a9dd0d86299b32b2343aa585b676756631. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FRX762371474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefcdae2db59ae65b6e356a546096ce9f7d9802644abc9f4010368e83f93d3adf. 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/FRX452117254.