thumb|upright=1.6|Poseidon resort in Greece thumb|Average number of vacation days over time in various countries A vacation (American English) or holiday (British English) is either a leave of absence
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 0x1c1a826592a5f7f530f352c38c6e1f1ad91f0a1edc55d1fb359da2c92c978fcc. Chain 2 (Bitcoin): anchored in block 953660 (2026-06-14T17:20:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/52db5de7-66c7-48c6-80c3-5bc90f011d98.json and https://artists.proofprofile.net/proofs/artist/52db5de7-66c7-48c6-80c3-5bc90f011d98.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 0x5639b26c52eef373da5459f1a1d07a49f95db1a25243cf26fb6ee7d1944dcd39. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/US4KC1183612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x900382dc2d92ea9982f0a1d40745c63f14d6321f2a0b93144d74eb02de9aaac6. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-16T02:10:03Z), 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/USA2B1512425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5784e8f9b25f420eb617ca9b7ac107c7ee5525f5384b9d27cbeacf0b22ee495b. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T02:41:02Z), 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/USA2B1512426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6edcce0972db137d83d976e9a5c8276070e6141f13078c0819f032abb6d0ab3f. 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/USA2B1512432.
Back to the Land / Back to the Land (Version 2)
Southern Grass: The Continuation of Rock and Roll, Vol. 2
Southern Grass: the Continuation of Rock and Roll, Vol. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe7fdf141a3943fd2d0821fb0e45bcde426b323fa1994f8ecc6459188468dedd. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USA2P1860805.