alt=Pedro Piquero|thumb|200x200px|Pedro Piquero Pedro Piquero (Seville, 1976), also known as Pedro Kaiten Piquero, is a Spanish pianist, translator, Zen Buddhist teacher and animal rights activist.
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 0xfd300225e9cde828fea4c1416bcb64ab362c41098c4a25792b984681556f874f. Chain 2 (Bitcoin): anchored in block 953968 (2026-06-16T16:01:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/29b6e01b-0a41-4167-9761-e20d2bf18a9b.json and https://artists.proofprofile.net/proofs/artist/29b6e01b-0a41-4167-9761-e20d2bf18a9b.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Sevilla. Suite pintoresca, Op. 2: I. Bajo los naranjos (Beneath the Orange Trees)
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 0xe11e829fe8d165b5f34189cf81a1898dda7d3e258cdc0b4235c7870d38fd67e1. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY332401012 — a six-check JSON result.
Sevilla. Suite pintoresca, Op. 2: II. el jueves santo a medianoche (Maundy Thursday at Midnight)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fb1c78ff59db7d577da5bf247fe2562819a378ae09dcda0d3ede4600f54483a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY332401013 — a six-check JSON result.
Sevilla. Suite pintoresca, Op. 2: III. la feria (The Fair)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ee500c5aaecc8d50ae6fa9a07c29985934984bd8da4f929c9e944285c50116f. Chain 2 (Bitcoin): anchored in block 960430 (2026-07-31T16:09:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY332401014 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb93de24874d54e68858fd845b5e5fc41e915331067be63c1f7ab856c93d1ee04. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY332401015 — a six-check JSON result.
5 Danzas gitanas, Op. 55: II. Danza de la seducción (Dance of Seduction)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7234a5e4298a2611ad5deaa12205bebd7eded5d6059c328322b597be71c92f5a. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY332401016 — a six-check JSON result.
5 Danzas gitanas, Op. 55: III. Danza ritual (Ritual Dance)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01cef1d6c5c7d8b791ad08c08e67ba12729c0c16830c2b61be0f7ac9f8df5439. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY332401017 — a six-check JSON result.
5 Danzas gitanas, Op. 55: IV. Generalife
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8195809f077426212e0c9ce7681ff65c454c9684598f1baea8e72bfbd38aff06. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY332401018 — a six-check JSON result.
5 Danzas gitanas, Op. 55: V. Sacro-Monte
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefea133fa89a5044b49e1ab191adc566cffe53e6cd99071a9508c15c1c187709. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY332401019 — a six-check JSON result.
Danzas fantásticas, Op. 22: I. Exaltación (Exaltation)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1789a7fa9188443b07f29fd685867d9613df91dffeafb9d3bcc2b12043eda9b1. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY332401020 — a six-check JSON result.
Danzas fantásticas, Op. 22: II. Ensueño (Fantasy)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x575263fc9fe59ebce51a2f93a145e726ec6311fad109baa852cf35e41993f9ea. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY332401021 — a six-check JSON result.
Danzas fantásticas, Op. 22: III. Orgía (Orgy)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d6caa4b45b735d1228bf4c58a9c9e44a1b819696fd18a886e9c3678f921505f. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY332401022 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x854e68ed594481b05dae5112ea71ac39927a8308b1850a89c813bbdb08331fde. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY332202337 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa42a6d1de7b14f245ca980ffa791e200e03da82c95df994f0811c1c52e439fa3. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY332202338 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98ce235cb006c7c5d52a90d52fa679d2ac022c05a54a3bd64ad94504b761d049. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY332202339 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x519defc54b9a201d6d50b79a95e9cf8e77ccb5f1183f9d3f82624f9688cf5824. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY332202340 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba967ce38a367f402b9a3ba442f62d3e762d8a4e6aaa53fbb384e1d40c5f094a. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY332202341 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad25b3f3f5c1a6bf2722ed7736c298e6c2daa41f3d8f223df0e9cb26ce077e98. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY332202342 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2785cdc29e814bbbbb8bace430fb2fce70e312c170ce3a98b3fe28abc6a77520. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY332202343 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c846e0ca5099527e1593ad215b3f23a72ee82708983158c8563aeaf062acac9. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY332202344 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb71678e12ce70d5c65cf1ac45febb7cb8b31bf9563b5cdb235e13340bcecf25b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY332202345 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc025ebc40123f5aa8fc075b9bd22d77db47b7bd7f8049f0a7875770b0895d44d. Chain 2 (Bitcoin): anchored in block 960230 (2026-07-30T08:32:18Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY332202346 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3917270aa9862c023afe68a028d3ac79885b92a1bcf2b2257702b1aa575273e0. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY332202347 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18afd6ff3484d12c9015d2fff28dbcbc2491ff31943d768878a17a543a90d1ad. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY332202348 — a six-check JSON result.
Album de Madame Bovary / Historia de Babar, el elefantito
Manuel Blasco de Nebra: Complete Piano Works Vol. 3
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